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      08-29-2012, 10:09 PM   #17
MilehighM3
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Drives: E90 M3
Join Date: May 2011
Location: Colorado Springs

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Definitely double check the hold down straps installation. As you are well aware, that's the peak boost window on the N54 and the highest load as a result. If that checks out okay and you're hesitant to want to pull the valve cover, try swapping a known good set of coils and plugs from another car. Injector misfires are usually on cold start in my experience. The mileage seems to be low for excessive carbon build up I cause a misfire. It's more likely you got a bad part off the shelf than extreme carbon build up.
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