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Originally Posted by curtis73
By the way... are you sure about the engine and year combo?
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Yup, he's right. GM sold this combo for list about $1000 less than the automatic trans, around here. For what you got, the price, especially for the 5 spd was an amazing deal. I seriously considered buying just this exact combo, this past spring.
This drivability problem is engineered in to reduce emissions, (NOX, I believe, but I am not sure). Many GM carbureted engines from the early/mid 80's had a mechanical valve which did the same thing.
Essentially the valve behaved like a temporary vacuum leak, and was very irritating. The valves could be plugged. Maybe these engines have a valve that can be plugged, too, (I am not sure) If it is ECM related, perhaps an aftermarket PROM performance chip might help??