Hey guys, new to Audi's, just picked mine up Monday. a bit of an issue has crept up, when I accelerate, it begins to flutter or stutter a few times as the RPMs go higher. it is the worst when cold, but still does it (although less) when warmed up. one guy suggested that it was a wastegate issue on the Turbo...what do you think? it is a 97, 1.8T quattro. thanks.