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Rough idle and acceleration on 1998 Chevrolet Silverado 5.0

I had a tune up last year when I had intake manifold replaced, car has ran great until last week. No codes came up at all, but car runs rough. I replaced the cap and rotor today and did an oil change, still running rough. Last week installed a new fuel pump and filter and that is about the time my problems started. My old fuel pump just stopped working. Could it be fuel pressure? Plugs? Vacuum?

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Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.

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Posted on Jul 26, 2009


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