Hi guys, back in an old quattro for the winter, very pleased to be back, forgot how much i missed quattro drivetrain after running some rwd and fwd vehicles, I have purchased an old v6 tdi its done over 200k but still going strong, now i have an issue. At full throttle at the pedal, it seems sluggish and whistles/hisses like it has an intercooler leak or a split hose, I havent been under it yet but i will do, then when you release the pedal, it has a surge of power during the release, so i quickly realised it was performing better at half throttle, so i have been gently letting off the throttle under acceleration to find the sweet spot, its around halfway. Doesnt hiss and pulls harder. Im thinking its maybe boost/fuel mixturte related possibly or a faulty TPS, but they dont have a throttle do they? Ive only been used to 2.7t lumps in previous B5 S4's so the v6 tdi is a new beast for me. My viscous fan is stuck on so it sounds like a train. Can anybody tell me why it seems to be pulling harder at half throttle and not good at all at full throttle and what i can check? Many thanks folks.