Use Valvoline's Synthetic Carb, Throttle Body and Choke cleaner. THE best by FAR. I've tested a number of TB cleaners out there (gumout, motorcrafts best stuff, STP, etc) and the Valvoline SynTech stuff absolutely blew away all the other cleaners. Carb deposits MELT away with that stuff!! Hard to find though, I coudln't get it anywhere this last weekend when I overhauled my Intake manifolds... :/ I would say the Motorcraft combined with the Gumout did the second best job (gumout's stuff is like $1.67/can at walmart, so get like 6 or 8 of them, you'll need it all!!)
