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1) Bad/clogged Idle Air Control (IAC) especially if you have a oil and gauss air filter.
2) Air leak in the duct between the air filter and Throttle body.
3) Bad or clogged Mass Airflow Sensor (MAF).
4) Bad Throttle Position Sensor (TPS).
If no throttle cable the throttle body assembly..
it sounds like it's the idle air valve this controls the idle and drive rpm's when you step on the gas does it sometimes at idle go up & down by itself repeatedly? it could be something hitting the throttle and when you press down on the gas or shift it is knocked out lowering to normal idle/rpms, the tps is on the throttle body and is connected to the throttle lever and most likely right on the other side of the lever a little switch with a electrical plug on it search it so you can see what it looks like if you don't know already they are sealed and can not be cleaned you must replace it try checking with the car in park engine running and raise the idle by the throttle lever if it goes smooth up and down return to rpms that's not it if it races or sputters and then raises up that's it or it could be both units are blown out needing to be replaced
P0507 Higher idle speed than expected partially stuck open thermostat engine running colder than normal raises idle speed. Small vacuum leak raises idle speed. sticking throttle cable holding throttle plate open. P0741 Torque Converter Clutch system stuck off : Code conditions : No engine or transaxle system codes set, engine run time over 5 seconds , Throttle Fluid pressure switch not indicating Park/Neutral,TCC commanded On @ max duty cycle, throttle angle over 8% Trans fluid Temp input 68-248f Degrees not in fuel cut off, trans gear ratio indicates 2nd, 3rd, 4th gear delivered torque 32-150 ft lbs, the PCM detected a TCC slip value that was over the torque limits . most likely cause is bad tcc solenoid or torque converter itself. Trans shop can diagnose and repair
most likely the idle air control valve is dirty.try cleaning it,if that doesnt fix it test the throttle position sensor.TPS usually causes higher than normal idle speed or intermittent misfires depending on throttle angle while driving.send me a msg for test procedure if needed
Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.
one of the most common problems on cold start ups in colder weather is the intake gaskets leaking causing the engine to get extra air this will cause a rough running for a minute or two and once starts to warm up it smooths out. this sounds like what you are experiencing. I would have that checked. might also wanna try to clean the throttle plate this gets debris on it and will reduce the airflow rate and cause low idle and the computer tries to compensate for it and can cause a surge at idle but this is usually all the time.
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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