My trusted VW mechanic has replaced the throttle body on my '01 2.0 four times now . The last was an aftermarket Bosch, but prior to that we tried used. The first replacement lasted a year before EPC light. Since then, less and less time between failures. Inconsistent and random performance from no power, no throttle response, to high revving. Becoming obvious the throttle body is not the culprit. What else could it be? 160k/miles and other wise runs great, just returned from a 1500/mile road trip, in Idaho and Montana the speed limit is 75mph and I still averaged 29.5 mpg with A.C. running most of the time!