I just bought a 2002 vtx 1800c with 12,000 miles on it, and I am having all sorts of troubles. I am averaging 14 mpg, the bike surges under low rpm when the motor isn't working very hard, and when I get on it black smoke pours out of the exhaust. I read through a lot of the posts and have tried the grounding fix, new plugs, tunning the power commander, disconnecting the power commander, and also the fpr test. My question with the fpr test is, if it is bad where is it supposed to leak the fuel at? Because when I pulled the vacuum line it leaked out of the breather hose for the fuel tank, that is located down where the swing arm connects to the frame. Please give me any advice you have, I'm hoping that spike has the answer!!!