Carbs are not difficult; they just require a systematic approach--like almost anything else. Unless it is new out of the box, assume NOTHING is correct until you have verified it. Don't go changing parts willy-nilly. Proceed in any orderly fashion. Cars and other power equipment have used carbs for well over 110 years. At least with a carb, you can usually see the problem. Its very difficult to trace the electrons moving around inside the chips in the EFI computer.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags