2006 toyota corolla car starts but then stalls when pressure applied to gas pedal and when put in gear

See if there is a thicker foot mat placed under the throttle pedal. If so remove it and check it again.

You have to explain in detail what was checked & how
by the mechanic

I would start with checking fuel pressure at the motor with
a gauge & road test with the gauge tied to a wiper

Is the battery any good?

Was the TPS Sensor back probed & checked?

You got a MAP Sensor on it,that could be a problem?

Checked EGR System over good

Checked alternator voltage,current & diode leakage.

Bad ignition switch?

Fuel pump relay?

Coolant temp sensor

Have to test the entire vehicle Evap System also

Vacuum leaks

Exhaust Leaks

Meachanical Condition --cylinder leak down test

It can be low fuel pressure issue or clogged fuel pump.Or its engine related issues,---------------
Check the help link mentioned below to troubleshoot the problem :------

Engine stalls when gas is given?

http://technoanswers.blogspot.in/2012/01/engine-stalls-when-gas-is-given.html

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Car stalls when MAF sensor is connected?

http://technoanswers.blogspot.in/2012/01/car-stalls-when-maf-sensor-is-connected.html

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Car Engine Stalls While Driving?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-stalls-while-driving.html

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Car stalls and throws white smoke from exhaust?

http://repairhelpcenter.blogspot.com/2012/01/car-stalls-and-throws-white-smoke-from.html

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Stalls And Dies At Stop Sign?

http://www.howtobyme.blogspot.com/2012/07/stalls-and-dies-at-stop-sign.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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1992 Chevrolet stalls and shutdown?

http://schematicsdiagram.blogspot.in/2012/04/1992-chevrolet-stalls-and-shutdown.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1990 mazda 323 stalls and quit running?

http://technoanswers.blogspot.in/2012/02/1990-mazda-323-stalls-and-quit-running.html

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2000 Toyota Camry: Idling and Stalling Problem?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-idling-and-stalling.html

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1995 Toyota Corolla: Stalls, Sputters and Pops Through Intake Manifold?

http://whatisbyme.blogspot.in/2012/05/1995-toyota-corolla-stalls-sputters-and.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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Dodge Dakota stalls, stumbles at idle. Has low fuel flow and runs hot?

http://schematicsdiagram.blogspot.in/2012/03/dodge-dakota-stallsstumbles-at-idlehas.html

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1994 Toyota 4Runner: Stalls and Stops While Driving?

http://whatisbyme.blogspot.in/2012/05/1994-toyota-4runner-stalls-and-stops.html

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1997 Toyota Camry: Erratic Idle and Intermittent engine stalling?

http://technoanswers.blogspot.in/2012/04/1997-toyota-camry-erratic-idle-and.html

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Ford Maverick: No Idle and Stalling issues?

http://schematicsdiagram.blogspot.in/2012/04/ford-maverick-no-idle-and-stalling.html

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These details will help.
Thanks.

possible clutch failure --sounds like clutch is slipping

It can be clogged intake manifold or issue with low fuel pressure or the problem is low battery voltage or issue with clogged fuel filter.Inspect all this basics.For more troubleshooting,click the link below and go through troubleshooting:----Stalls, Sputters and Pops Through Intake Manifold? http://whatisbyme.blogspot.in/2012/05/1995-toyota-corolla-stalls-sputters-and.html
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Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
--------
Stalls and Stops While Driving? http://whatisbyme.blogspot.in/2012/05/1994-toyota-4runner-stalls-and-stops.html

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No Idle and Stalling issues? http://schematicsdiagram.blogspot.in/2012/04/ford-maverick-no-idle-and-stalling.html

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Vehicle starts then stalls and shutdown? http://schematicsdiagram.blogspot.in/2012/04/1992-chevrolet-stalls-and-shutdown.html

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Engine stalls when gas is given? http://technoanswers.blogspot.in/2012/01/engine-stalls-when-gas-is-given.html

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This will help.
Thanks.

Did this start all of a sudden ? after buying gas? If you are right about not getting enough gas ... perhaps you bought some REALLY dirty fuel. My '94 has a drain plug on the gas tank ... you might open that up and see if you get any gunk/water out of the bottom of the tank. After that check fuel pressure and those sorts of things.

it req a new engine ecu.

replace gas filter first and get that old gas out of tank and fill with good gas

This sounds like a computer fault The electronic version of the choke not working There's a sensor on the thermostat housing with 2 wires going to it That's the sensor that tells the computer the engine temp May be faulty

IF THE PEDAL IS LOW CHECK FOR AIR IN THE SYSTEM. IF THATS NOT THE PROBLEM YOU WILL HAVE REPLACE THE CLUTCH MABY A COLLAPSED PRESSURE PLATE