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warm starts = high rpms

841 Views 6 Replies 3 Participants Last post by  67MIke
the 89 rc has picked up a new trick somewhere. When it is warm or you shut it off and run in to a store, come back and restart the truck it revs real high then goes back down to normal. Any ideas. Still has everything stock on the motor. I doubt the o2 sensor has been replaced yet (318 auto)
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around 3k, give or take.not like a cold start.
Yes, But what does it all mean basil?
Okay, I see now. It idles and runs perfect. Sometimes it revs to about 3 - 5 k and idles back down after the initial blast. It's probaly a good asumption that it's probably worn out. 109k and still stock as a rock, aside from a new water pump.
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