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It's not throwing any codes out, at least, none that my cheap code reader sees.

I've been chasing a misfire for about a year, and two different garages haven't been able to sort it and the local rolling road flat out refused to look at an RS4:( Any input gladly received, these are the symptoms: Misfire under high engine load, ie 6k revs and booting it in 3rd, will deliver power...