Recently my S3 (BAM engine code) has starting to be a bit hesitant on acceleration. When cold it can be particularly recalcitrant in first. On very low throttle openings in first (eg in crawling traffic) it kangaroos rather embarrassingly. And then sometimes on full-bore acceleration (eg overtaking), it can accelerate at a certain rate and then suddenly the power will surge and the car leaps forward in a manner that suggests there was a slight blockage that has just cleared. It never feels particularly sluggish - it's just this sensation of sudden surge of extra acceleration that can rather catch me out (particularly if I wasn't intending to go any faster). Could this be MAF-related (I've never really understood what the MAF problem was so not sure)?