1992 Chevy Van engine surging/hesitation

1992 CHEVROLET VAN
166,456 MILES • V8 • 2WD • AUTOMATIC
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NEAL KOHLER
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Gentlemen,
My van has an intermittant engine surge which occurs when engine is hot or cold. I have had a recent tune up, new filters, new fuel pump and two diagnostic computer checks, all to no avail. It sometimes does not occur until the next day. When it does run properly, the engine idles and runs beautifully. Thank you for any help with this annoying situation.
Feb 22, 2009 at 12:32 PM
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JACOBANDNICKOLAS
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Hi:
If there are no codes and you replaced the fuel pump, then I would be looking for a vacuum leak. Is this a 305 CI V8? If so, check around the intake for leaks. Also, check the EGR to make sure it isn't sticking.

Let me know what you find.

Joe
Feb 22, 2009 at 1:44 PM
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NEAL KOHLER
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to:Jacobandnicholas
The engine is a 350ci fuel injected. We have checked for leaks several times. The EGR valve was replaced during the tune up. Appreciate any other ideas. Thanks
Feb 25, 2009 at 12:41 PM
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JACOBANDNICKOLAS
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The only thing I can think of is a bad TPS or IAC. The problem is without a check engine light and a code, I can't be sure.
Feb 26, 2009 at 8:04 AM