VAUXHALL CORSA GLS 16V 1998-2000 1199cc 5 DOOR HATCHBACK Manual Petrol I have owned my corsa spec as above for two years now and when i first bought it the exhaused was blowing, so as it was under warranty i took it in to get fixed, however a year later when itook it for its MOT the problem was back, i am under the impression that the part that was apparently changed wasnt, anyway i wasnt in any position to get it changed last year and had it gummed up, obviously now that has also run out, but my engine light is also now coming on and it has been kangarooing, also yesterday when waiting at the traffic lights it started revving by itself???!!! i have it booked in at my local vauxhall garage on friday (the same place i bought it from and also where i have had it serviced and had my MOT's done so far) after being advised by another garage that it would have to goto a vauxhall garage for a diagnostic test. i just wondered if anyone had any advice or tips for me before i go there and face them