Quote:
Originally Posted by A1337STI
is it likely that i've cuased permanent motor damage ? 
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Very unlikely. Like I said, a million things can cause misfires. I used to get them in my RS after I did the Exedy flywheel because the ECU couldn't accept that revs were suppose to rise and fall that fast off-idle.

So, replacing plugs and your stock airbox *should* fix the issue.