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Ok I'm running out of ideas and vwwatercooled isn't being useful as none of them work on their cars.

Car is a 2001 beetle, 1.8 turbo, AWU motor.

Ok so I've got a really bad miss from about 3500/4000rpm. Massive backfire/flames on gear change. Sometimes it goes away, always does it if you drop a gear.

New coil packs, new spark plugs, no air leaks, new blow off valve, 3" dump pipe/cat removal pipe.

My only thoughts are was previously tuned for more boost, boost control removed, now floods because no boost. Colapsed rear muffler, pod filter letting in too much air or dead afm.

I'm hoping someone will have a new perspective and suggest something ive over looked.

Edited by lilcrash
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https://www.sau.com.au/forums/topic/378374-strange-engine-miss/
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