well ive been reading threads for hours and hours but cant seem to find the exact same problem anywhere. i just got a 98 jetta tdi with 265k miles... dont have any service records. i believe the t-belt has over 100k on it and plan to do it asap. but my bigger problem is lack of highend power... it does ok from 1500- 2200 rpm but after that it just slowly climbs. boost at low rpms but not much after 2200. air filter and air box seem ok... fuel filter somewhat new... no obvious broken vac lines... runs worse with maf unpluged. starts great and idles great. any thoughts????