I just got my local Audi specialist to pull a fault code off my 92 Audi 2.0 AAD engine and it's : 005870 - adjustment limit mixture (intemittent). Anyone know what this could be? I'm try to solve the problem of my cars' poor starting and the fact that it cuts out while warming up (when the clutch is depressed - only happens once!).

Any help really appreciated - thanks