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It is likely that the engine management system has lost its base line calibration. If the battery is weak and during the crank to start the voltage dipped low enough the Engine Control Module lost its calibration. If the pedal is depressed during the crank the TPS (Throttle position sensor) will lose the idle position for the throttle. The hunting and surging and resultant stalling is the ECM seeking out the limits and re-establishing the throttle idle plate location.
If battery is OK than running the car allowing the calibration of the vehicle to reestablish itself will correct the problem. My experience is that this happens if the gas pedal is depressed during crank with a very very low battery voltage. Always the best way is to not touch the pedal during any cranking starting procedure. Or after a battery replacement.
To accelerate the calibration process attempt to run the car ingear tring not to allow the car to stall. After afew munites the car will have reestablished its normal running calibration and you will be allset.
When you say it wont turn over that implies that you can not hear the starter turning the engine over. If you can hear the starter cranking the engine over but the engine will not start try holding the gas pedal to the floor. Be prepared for the engine to start and let off the gas. If the engine stalls when you let off the gas try starting again but feather the gas pedal after it starts. It it stays running with the pedal depressed than I would agree that there is an issue with the IAC and it may need to be replaced.
you may have a frozen fuel line. fuel not reaching engine. put some dry gas in it to displace moisture in fuel system. the reason why it quit when pushing pedal is, its starving for fuel. have a good day !!
The oil system reminder needs to be reset so the computer knows you had the oil changed. The procedure is in the owners manual but can be tough to find so you might have to do a little searching for it. Many of the GM vehicles can be reset by turning the ignition key to "run" [but don't crank or start the engine] and then fully depressing and releasing the accellerator pedal smothly three times within 5 seconds. Turn the key off, wait about 10 seconds and restart the engine to see if the reset was successful. Check your manual first as not all GM's can be reset this way and yours may be different.
you may have flooded the motor jusy wait half hour and retry if it doesnt start try holding to the floor and cranking untill it trys to run then by holdig it down it clear the flood only crank 15 to 20 seconds and dont take foot off pedal when you stop cranking just wait 30 to 45 seconds to crank agian and never let up until it runs. hope this helps Thunderboltz
there is a button on your brake pedal lever that while braking gets
depressed, and turns on your brake lights. Now this component is a
plastic piece that can get knocked loose rather simply. You either need
to re-secure this component, or replace it
(you can get this part at any junk yard for nothing more than some pocket change)