hi mate, thats odd.. sounds like something is blocked, maybe try cleaning out the throtlle body, its easy enough with some carb cleaner if not take it to midland vw (local enough)
think that might be your best bet, thats in dollors but id say that would be about 90quid for 80? so lookin at maybe 120 total... thing is it only cost me 350 for my split rims with bolts... but i did have to get adapters i guess....
I use meguirs gold class shampoo i got mine from ebay heres a link http://cgi.ebay.co.uk/MEGUIARS-GOLD-CLASS-SHAMPOO-FREE-POSTAGE_W0QQitemZ270453751908QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3ef84cc064&_trksid=p3286.c0.m14 you wil pay twice that in the shops.... and megiurs gold wax http://cgi.ebay.co.uk/MEGUIARS-GOLD-CLASS-LIQUID-WAX-WITH-FREE-APPLICATOR-PAD_W0QQitemZ270462914951QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3ef8d89187&_trksid=p3286.c0.m14 both much better than the halfords stuff, and smell nice too lol