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Old 11-07-2013, 01:28 PM   #7
69gmcc10
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Join Date: May 2011
Location: Missoula, MT
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Re: 01 6.0 random misfire

How large did you make the holes?

If you think it is the cats, you can disconnect the exhaust from the headers, let the y pipe dangle with enough room for the headers to flow freely and take it for a quick drive. it will be loud and throw codes that you need to clear, but if the power is back you have a clogged exhaust.
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