Q: Random stalling

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I have a 93 GMC Jimmy the likes to stall out on me in the most inconvenient times, it idles really bad like it wants to die on me , I have asked a few mechanic buddies of mine what it could be , they said to check the hei module , I did and the prongs that plug into the distributor were rusted , I cleaned it and so far it has not stalled but I still have the idle issues, would changing the hei module help at all ? And what else could possibly be ?
My car has an automatic transmission.

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