Sorry for the lame title, but I don't really know what to call it. I have a stock 1982 FJ40 with all the emission stuff on it and passes Cal smog check. The truck runs great expect when I transition from off gas pedel to on gas pedal. It hicupps/bucks once. It's been doing it for about 6 months now and it's bugging me. It also does it when I'm in a very slow deceleration, it will buck and almost feel like someone tapped the gas pedal??? I originally thought it was the carb but I rebuilt it and same. Replaced sparkplugs, cap and rotor and wires, still same. Could it be a faulty smog pump? The smog pump goes to the air injection rail and there is a checkvalve inline... Could it be that? Any ideas would be great..