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Re: Stalling & hunting idle
Check for vacumm leaks warm up engine poor water on intake gaskets and injector seals if engine stalls or runs worse its sucking in the water thers your leak.
if not clean throttle plates and IAC motor
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This can be either an engine management issue (bad idle air control) or a transmission issue if an automatic trans (torque converter lock up problem). Idle air control can often be cleaned so = cheap fix. Trans problem not so easy.
Generally speaking, the common reasons for stalling are a faulty idle air control valve or a dirty throttle body. The computer controls idle speed by how much air is allowed into the intake thru the throttle body. Those two issues would be checked first. Is the check engine light on when the engine is running ?
DO you have any engine codes still remaining? IF car restarts right away its gonna be tricky finding out what is dropping out. Engine codes are the best clue to start the hunt for problem. From experience however, I have had a few of these come in for same symptom. There are two wires that run from Ignition module/coil pack to the crank sensor, insulation falls off and they melt to each other or to hot engine, intermittent short disruption of signal, hence car stalls whenever wherever and restarts right away.
im assuming that changed the oil unit you mean sending unit ? if so could be electric short in the pick tail or worse wiring harness. second there is also possoble vacum leak .third while unit was being replaced something didnt get put back or got knocked loose. created a new problem. most times as thing are going bad they dont register until it is a prolonged problem as it took 2 days for the check engine to go out that also might have been normal. you might also notice while sitting at park when you turn the wheel you will notice ia differance in the idle, if its almost stalling then its probley your idle,needs re set, or your idle controle valve is going bad ,did it get checked or cleaned when they serviced the throttle body. and also could be your mass air flow sensor going bad or need cleaned
I HAD THE same problem.... 87,000 2000 grand cherokee 4.7l when i let off the gas it might stall. happens 1 to 4 times a day. so far i have replaced the crank shaft sensor - it stopped stalling for 3 days $130 cleaned the throttle boddy free replaced the throttle position sensor $72 replaced the idle air control sensor $132 replaced the map manafold airflow sensor $125 no luck it is still stalling. by the way i have done all the work myself. it was about 30 minutes for most parts i just ordered a rebuilt ecu or pcu engine control unit. they program in the vin, mileage and part nbr so you gc will recognize it. $185
installed ECU 2 days ago...... so far so good. good luck