I’ve just bought a 2002 passat tdi se thinking it would be a good reliable run around after loving Vdubs for years (mainly mk2 golfs). The passat normally starts fine (as it did when I was viewing it before I bought it!) but every now and again I turn the key and the glow plug light doesn’t extinguish and then I go to start the car and it starts but revs really high (4000 rpm) for about 2 seconds before returning to idle and then functioning as expected. Quite a weird fault and not a clue where to start so thought I’d ask on here?