hi there i have a mk 111 tdi 1.9 tdi auto ,i read a topic that said if this started and then stalled and then started again and then fine could be the key ,changing the key could be the anserw ,but this is intermitent.could this still be the cause or have i got a relay going.and secondley has any one expreinced when you return from revving up engine you have a deep like rumbling,like exhaust blowing and returning to normal no rumbling ,no blowing noises cheers going on holiday soon terricfic ah ah cheers help please