Question about 1990 Chevrolet Caprice

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Where could i find a vacuum diagram for a 1990 chevy caprice ..4.3 engine ...this car will buck jump then a bad loss of power and will die...wait a minute then then start and runs ok.....no service engine light comes on and computer test show nothing....some of the natural gas equipment is still in place and i was told it is a vacuum problem and needs to be put back the way it came out....please anyone with info on a vacuum diagram i would greatly appreciate it...thanks david

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There could be a vaccum diagram in the engine under the hood. IF not I would go to Alldata,com. The get the information from them. The dealer might be able to provide a copy of it,

Posted on Jul 18, 2009

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And remember when buying engine parts in the future to tell the counter guy "It's for my other car--the 1990 Caprice."
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