1989 Chevy Beretta runs rough

1989 CHEVROLET BERETTA
138,000 MILES • 4 CYL • 2WD • AUTOMATIC
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COLEMANLANTERN
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The engine started running rough about 2 weeks ago. Seems to be flooding. Had O2 sensor error and replaced that but no change. Still have a 24 error (VSS). Cleaned the EGR valve and made no difference. Doesn't seem to have a vaccuum leak but haven't measured either. Can drive it but only if it kept at a higher rpm and find the "sweet" spot in the throttle.
Aug 30, 2010 at 8:25 PM
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JACOBANDNICKOLAS
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When was the last tune up? Also, have you checked fuel pump pressure? Finally, this problem can be caused by a bad throttle position sensor or idle air control valve. Has the check engine light come on?
Aug 30, 2010 at 9:01 PM
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COLEMANLANTERN
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No I have not checked fuel pressure. Are you thinking it's to high?? The check engine light will come on periodically but nothing consitent. The only error code is a 24. Last tunup.......it has newer plugs and wires but could not tell you when. They were installed before I got the car about a year ago.

How do I check for throttle position sensor or idle air control valve?
Aug 30, 2010 at 10:14 PM
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JACOBANDNICKOLAS
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Either one will set the check engine light. I would recommend checking for vacuum leaks and fuel pressure. If you need directions, let me know.
Joe
Sep 1, 2010 at 7:22 AM