Got an OBD2 VR6 engine in my Sharan and it's got problems. It's a bitch to start, when it starts it won't tick over, and if it does eventually go it runs like a bag of crap. It's better when it warms up but who wants to sit outside their house for five minutes before going anywhere ? Changed the MAF several times (2nd hand, 2nd hand, new but not OEM) but it hasn;t made any difference. There is a whining noise coming from the throttle body when I first turn the ignition on. Plugged another one in and it made the same noise. The non- return valve that goes into the air intake is split, and ther