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Old 12-13-2018, 10:12 PM
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Diseasel300 Diseasel300 is offline
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Join Date: May 2016
Posts: 6,023
A weak cylinder absolutely will smooth out with revs. Don't believe it? Crack an injector line and rev the engine up to 2 grand. You'll swear it was "smooth".

The "puff" noise in the exhaust is a probably have worn valve guides/seats causing a compression leak.

Compression and/or leakdown test should be in your future to diagnose further.
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