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I had an 89 that did the same thing. The only trouble codes I ever got indicated that there was problems with the transmission speed sensor assy.and cam sensor* (which I replaced*) I finally gave up and sold it for parts when it became flat out dangerous to drive. It had 205K on it and was not worth putting a lot more money in. Seems common on these cars. Perhaps someone here who is a GM tech could advise further.
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