1990 Other Isuzu Models

1990 ISUZU
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SCOTTRYAN
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Engine Performance problem
1990 Other Isuzu Models 4 cyl Two Wheel Drive Manual

I resently put a new moter in my truck. All works well except when idleing the rpms surge up and down. Self diognostics tell me nothing. All vacume lines are new and correct. EGR seems to be working properly and fuel injectors dont leak.
Oct 12, 2008 at 1:51 PM
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DOCFIXIT
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Maybe faulty Idle Speed Control motor located on throttle body.
Oct 12, 2008 at 2:09 PM