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Re: dieseling
Hmm... mayhaps perform an upper cylinder cleaning? You can get a can of stuff from a GM dealer for this purpose - basically you run the engine at a mild RPM while you slam this down the throat of the carb/TBI unit fast enough to cause the engine to stall. Then you wait a while and then restart the engine and see gobs of whitish smoke screen the neighborhood - at least that's how I remember it worked - it's been 17 years.
You can also look for vacuum leaks.
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