Having problems with your 1991 GMC S-15 Jimmy ?
Severeal cylinders misfire
\015 1997 Chev 1/2 ton 4x4 several cylinders misfire runs rough, but clears up. Idle speed is very fast, also\015
Sounds like the TPS (throttle position sensor) usually located where the throttle body meets the intake manifold. It may need re-calibrating or renewing.
Repair Help & Product Troubleshooting for 1991 GMC S-15 Jimmy
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