1987 GMC Van

Engine Performance problem
1987 GMC Van V8 Two Wheel Drive Automatic 45000 miles

today a smog shop told me the reason my van runs badly when cold and the reason my check engine light comes on, is because on the top of the engine there's a fuel sensor? They said the van has a problem with " raw fuel; too much and its cutting out" and I should replace that part but heck if I can find it.
April 6, 2010.

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