after gettin my S3 smoke tested for boost leaks, from which they found only one more tiny leak, my car has not been very good at starting. In the morning when you initally start it after it has been left standing for a little while it doesnt like to idle and will accept no throttle, dropping up and down between 500 and 1500 revs on its own.

It never did this before, so could this test have possible buggered my fuel pressure reg? and not letting fuel system charge when intially starting. Altho when you switch off and restart its fine. Just did a 320mile journey to york and it was good on fuel and didnt glitch at all.

All they did was test it, never did any repair work. Will get a vid of it starting ina bit and get it on vagcom