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Put some SeaFoam in the oil and run it for a while. It does a great job cleaning the lifters. If it doesn't straighten it out, then you can tell which cylinder is weak by pulling plug wires. If you pull the wire while it's running and it doesn't change the way the engine is running, that's the weak cylinder...basically the one with the problem.
I bet the Sea Foam will fix it.
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Tom
1990 944S2 Cabriolet
2002 Chevy Silverado 2500HD
2003 Maroon Ford F350 dually
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