VW Passat Estate 1800CL 1985
I took the head off and had it skimmed, adjusted the valve clearences with new shims and reassembled the engine. It starts but runs so 'lumpy' it shakes the driver when ticking over. It isnt misfiring and it isnt slow to rev up. It's the same lumpiness you feel when the ignition timing is way too far advanced or when, as with old manual choke cars, the choke is left closed for too long. I've checked the valve timing as per the manual using the marks on the camshaft gear, fan belt pully and engine block. They all align correctely. I havent touched the carb except to remove and replace it and havent disturbed the ignition timing. Anyone have any ideas?
Many thanks Roger