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What is your question?
Already checked the donuts there good and checked the muffler it OK what else could be the problom
3 Replies
Check engine light on, truck running ok? Possible exhaust leak between cylinder head and exhaust manifold.
In a lot of cases the bank 2 convertor goes bad. Remove the o2 sensor between the manifold and the convertor and see if it does better, if so the convertor or muffler is restricted and needs replacing.