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Cylinder 1 Misfire,

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xcb789:
Hi all,
I have a misfire problem under load from cylinder one, Idles fine albeit not perfectly smooth but when it comes onto boost or try for high throttle it stumbles and the engine light flashes. Swapped coils and plugs and still cylinder 1. Ran some injector cleaner through it and it does seem to idle a bit smoother but still getting misfires. If you ask only 30 ish percent throttle then it will climb the rev range okay. It is when asking a lot of it that it goes. Floor it and it just stumbles at any revs. Is injector looking most likely? I understand these engines get carbon build up but that would cause different behavior wouldn't it?
Thanks for any replies.

ZoliWorks:
Same symptoms as you, was a faulty injector. It was a brand new S3 injector from the dealer as well. Failed after a month.

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