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'91 454: RPMs start to fluctuate at 65mph
Hello everyone, I just picked up a '91 C3500 Dually with a 454. The truck has been great the last few weeks but the only real issue I'm having is driving on the freeway. Once I hit 65mph, the RPMs start to fluctuate up & down almost as if it's trying to govern my speed. The truck will go faster...- nickskeeta
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- Replies: 2
- Forum: Engine Performance + Maintenance
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