hesitates on acceleration on 1992 Chevrolet Caprice

my 1992 caprice 5.0 hesitates on acceleration,feels like flatspot like a bad accelerator pump in carb.mil lite not on.when not under load revs ok,did tuneup two weeks ago for maintenance reasons.problem even worse with a/c on

by in Ridgewood, NY on June 28, 2010
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