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Old 10-31-2016, 11:06 PM   #3
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: Low Idle, Rough Acceleration, Shakes a bit

The outer ring on the harmonic balancer can slip so the timing line is in the wrong spot.

The timing may not be where you think it is.

This can be verified or ruled out with a piston stop and some work.
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