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The PO 300 is random cylinder misfires & I fail to see why you would not have checked for codes & found that issue and corrected it within days of getting any codes
It also sounds like you have a transmission oil leak & are low on fluid
I have seen this on many types of cars and trucks, first have the tech clean the throttle body, make sure he uses a good cleaner and tooth brush, open the plate with his fingers and brush carbon build up off throttle body and plate then rinse clean with throttle body cleaner, next check and clean mass air flow sensor ,
What happens is the throttle plate when closed allows a small amount of air to pass, after time carbon build up closes the gap little more causing lower idle at stops or when gas pedal released in turn causes engine stall at times, the mass air flow sensor also can cause a problem when diodes that read air flow get dirty and allows air to enter without computer knowing and causes lean condition,
The choke function is not working on a cold engine. 1 clean throttle body and IAC motor air pathways. 2. Check for engine codes, you are looking for a code that relatws to the wngine temperature sensor.
Try depressing slightly the gas pedal to see if the engine continues to run when you put it in gear. Might have to depredd gas pedal and brake simultaniusly. if the engine continues to run, then the problem is in the idle circuit. Try decarboning the throttle body and the idle speed control.
see when you say you step on it, and the vehicle stalls, it sounds as if it bein starved of fuel...you step on it, and therefore the demand is there, but not the supply. to prevent itself from over heating, the fuel pump shuts off...after a moment of cooling off, it fires right back up...get it checked at your mechanic...do the strainer on the bottom of the pump, and fuel filter as well...is it time for a tune up yet?
your fuel filter might be old and clogged. try replacing it. if it is and not enough fuel can get through, the engine will stall when you let more air in (step on the gas pedal).
idle air speed control valve(iac),too low idle or driveline problem like play in the drive shafts. if you put it in park and give it to say2500 rpm and let go of the throttle,does it return to 900rpm?if it dips down to 5 or 600 then to 900 the iac is bad.
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