The IAC may be bad/worn. you'll need a scan tool to verfy counts. Definitely check ALL your vacume hoses/connections for deterioration, cracks, and hardness. Also, if you car has a smaller than stock convertor ( and the tune hasn't been corrected ), it will cause a stall condition as you have described.
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'86 Gn with an RPE bullet. Almost everything else is from Cottons. 100% street car!
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