I have whirlpool dryer that the flame won't stay on

Try one of these diagnostic repair videos on YouTube:

https://www.youtube.com/results?q=Whirlpool+dryer+won%27t+start+stays+on+sensing

The question is are your clothes getting dry? The flame does not stay on constantly, but cycles on and off. Now if the clothes aren't drying properly, then the first thing to check is if you have good air flow coming out of the back of the machine and air flow completely outside where the vent exhaust to. If that is good then most likely your flame sensor has gone bad and needs to be replaced.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jason_4570d45317834dd3

What is "look Warm"

If the flame come on to start with, but then goes out and won't come back on I would suspect you have a bad coil on the gas valve.
If you see the flame cycle on and off, but the flame does come back on again this is normal. The flame needs to cycle on and off and not be on steady or the dryer would get to hot.
If the flame is cycling ok and the cloths just don't get dry then you need to check your dryer and vent for lint build up.

the flame sencer window my need cleaning

Ended up replacing the solenoids and the burner ignited, flame stayed on. Problem appears to be solved. Thanks for your help and posting.

check your exhaust vent to make sure that it is not blocked up with lint. If not then check to see if the flame comes on after the igniter check the peep hole in the front of the dryer.

The flame sensor is probably bad. This is located on the side of the tube the flame is in. Has two wires going to it. Try to short it out and see if the flame stays lit. UNDER NO CIRCUMSTANCES OPERATE THIS DRYER WITH CLOTHES IN IT WITHOUT THE FLAME SENSOR IN PLACE!!!!! The other problem might be air flow. If the duct is blocked the flame will trigger the high limit switch. Take the hose off the back of the dryer and turn it on. There should be a lot of air flow. If there is and the flame stays on the duct hose or outlet is clogged.

Is there an issue of goin to or from LP (propane) to Natural Gas?? The orfice and metering screw on the valve will need to be adjusted.

check the ignition might be a glo-bar element or a maintained high voltage spark module. once there is a pilot a flame rod or a millivolt generator opens the main valve for fire.