I have a 83', 1.9L fuel injected = Vanagon. I have replaced all engine gaskets, (including heads) water pump, = thermostat, fan switch, fuel filter, O2 sensor, piston rings, complete tune-up and = probably a half dozen other things I can't recall right now. I = have also checked out most off the sensors (coolant sensor #2, injectors, and etc) and any others my equipment could do all checked out = within specs. I used a vacuum gauge to check for exhaust back = pressure (cat converter) looked good as well. The problem I am having is = that the bus idles badly, shaky like. When I take it for a road test it's = breaking up at low RPMs and when I rev it real high it also breaks = up. It kind of sound like it is running on 3 cylinders. Another item = worth mentioning is that if I let off the throttle just right it kicks in = and sounds and runs like it should (much quitter and a lot smoother). I had = an exhaust gas analyzer hooked up to it and the mechanic adjusted the CO supposedly within specs. He also checked the fuel pump pressure = and found it to be OK. Any logical comments are appreciated. = Also the recommendation of a excellent VW mechanic in NJ would be = helpful!