I bought this car about 3 weeks ago, i guess the previous owner dumped some **** in the water to mask a blown head gasket. my problems started about 3 days after buying the car i noticed on my drive to work (13miles) the hot air went cold then went hot again.so asked the garage around the corner from work to take a look. at first they thought it was trapped air so purged the system. they took it for a test drive and the same symptoms appeared. they then did a quick head gasket test and POW the test showed positive. so a call to a pal with a garage and a call to previous owner which got me nowhere. i decided to try and fix. the car drove great boosted well and was super smooth to drive, just blows hot and cold. well the head was checked and pressure tested, think it may have been skimmed, will have to find out from engineers. all fitted with genuine vw/audi parts. all went fine until i collected it and test drove it, it was gutless, just didn't seem to be boosting. my pals then double and triple checked everything no fault codes, vacuum checked and smoke tested again nothing, air meter came up as below perameters, so fitted a new bosch meter, no change. so all left scratching heads and car although nice and smooth doesn't appear to be boosting and is really slow. anyone got any ideas or phone no. to call to discuss. thanks Mike.