My SC was doing this after a rebuild last year, and it got worse this year. I ended up finding a vacuum leak from the Decel Valve back to the intake (it was leaning out too much under decel and was backfiring into the intake). Once I corrected this, the car runs like a dream, with no backfires.
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Paul
1981 911SC/RS
2001 Audi A4 1.8T Quattro
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