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I am pretty sure that it is computer controlled. There is probably an input to the computer that is out of whack. There may be a code stored it the computer that may elude to the problem. If an input like a mass air flow sensor or crankshaft sensor is going bad, it will report false data to the ECM and it will make an incorrect adjustment that will flood or starve the fuel/air mixture causing a stall.

easier, try to clean or maybe change the IDLE AIR CONTROL VALVE, located near the throttle body, where the air intake is, it's not difficult, it's attached with 2 bolts, then it's like a pintle with one spring, check the spring shape and replace the unit with a new one, this valve controls the air flow to your engine and if it goes bad , the RPMS are likely to be low and also stalling could occur right away when you start the engine or suddenly too

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βˆ™ 2015-07-15 21:07:42
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Q: How do you adjust the idle speed on a 93 Plymouth van 33l FWD when the engine idles about 650-700 sometimes dropping to 500rpm and stalling?
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