A4 tdi unknown problem...help?..
 

New to the site so all the help is can get is most appreciated.

So here's my problem. Started the car all good. Touch the accelerator and the revs start going erratic and it cuts out. Started the car again and same problem. So I start it again but this time just slip the clutch. Moves no bother and doesn't cut out. It's got me beat. Any help guys??