I know this in the wring section but you guys have such a wealth of knowledge i thought i would try my luck! I have a 2002 VW Caddy SDI and I'm getting this intermittent problem! 1) Turn the key drive off and around as long as I like and all is fine! OR 2) Turn the key and no throttle response apart from slightly higher revs and I go no where! Can anyone help with a diagnosis please?