Question about 1988 Isuzu Pickup 2WD

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88 Isuzu truck (4 cyl) has terrible idle/black exhaust

88 Isuzu truck (4 cyl) has terrible idle and black smoke out of exhaust, but runs marginally better when at full speed. Idle speed has been adjusted so it will idle and not cut out, but truck shakes and sputters while idling. Last week truck started running wide open when idling like trash or clog in carburetor, so checked that, and now it idles terrible. Ideas?

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Did you check for vacuum leaks probably a vacuum hose thats been knocked off or eroded and needs to be replaced.

Posted on Apr 11, 2009

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