Question about 1994 Isuzu Trooper

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When car is idle it will rev from 2000 rpms to 1000 rpms and it will do so for a little bit. but after car has been driven awhile it runs fine.

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You have a vac leak. It's related to cold vs hot. Possibly throttle body gasket. IE: when it warms up the metal expands and seals the leak, when cold it contracts and exposes leak.

Posted on Jan 03, 2011

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