Check throttle position sensor. If it doesnt work right it can cause this. have someone check and see if any codes have been set by the "brainbox" some tps can be adjusted all depends on which one you have. ask parts dealer if this is one that can be set. If not replace it. most tps on olds,chevrolets,etc. have 3 wires. one is 5v in, gnd, and voltage out. most are set between .5 -.7volts at idle.
SOURCE: olds 88 '94.runs perfect,it will die suddenly,i
perhaps the idle air control valve needs cleaning
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