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Did you clean the EGR passageways in the intake manifold.
I would try some BG44K for combustion chamber cleaning (pour it in the tank).
How about one lousy tank of gas?
I'm not too keen on pouring seafoam into the combustion chambers. If I knew that was the problem, take a paint gun and fill it with water. Feed the highly atomized water into the intake to steam clean the carbon deposits.
regards
Mech
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