Hi people new to the forum not new to the scene been around vws for years with the last 5 being polos 2f and mk2 now have a 88 mk2 1.8 gt scirocco on a pierberg (which incidentally isn't running as it should

) and my engine seems to be tapping/knocking and I'm just wondering if anyone knows anything about these gt cars common faults and the like thanks in advance guys
