Normally means that the fuel injected into the cylinder is not burning correctly. .
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Thanks Randy, this is defenately pointing toward the one place I did not look. The boost sensor, I presume is driven from the black pipe following a routing behind the engine from the pump to the turbo. I will check this out since I had to replce this very tube becuase it was badly damaged. I pressume that the previous mechanic probably adjusted the boost sensor to compensate, and did not bother fixing the real problem.