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<p>[QUOTE=&quot;benjamin260_6, post: 11318268, member: 92592&quot;]This definitely sounds like retarded timing. If the bullgear was changed at a detroit shop then there&#039;s a definite possibility that they updated the ECM at the same time and now you have one of those wonderful low-nox calibrations. The TK60s and PK60s reacted the worst to those updates and are the most likely to get the low-nox update so if you have one of those, that&#039;s where I&#039;d be looking. It&#039;s a pretty simple fix but it has to be done aftermarket, not at a detroit shop[/QUOTE]</p><p><br /></p>

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