Im going to try and make this as short as possible but here goes, I have a 99' Chevy 1500 with a carbureted 350 swap. About a month ago I unknowingly filled my tank up with gas that, to my best guess was about half water. After a week or two of just driving my truck on the weekends I finally burned the gas down to almost empty. I filled the tank with fresh GOOD gas and added a can of sea-foam. It ran okay for a day or two and then started running like pure crap... I realized I forgot to drain the carb and the fuel lines to get the rest of the water out..... So, I did, and replaced my filters a then refilled the tank, with another can of sea-foam. It runs better now but I have a weird hesitation taking off from a stop and while cruising at one speed. The whole truck bucks like the engine is cutting off and starting back with every turn of the motor. As long as I'm accelerating the truck runs better than it ever has! Ive checked my plugs and wires. They're all practically brand new, I did my annual tune up about a month before my problems started. I even went ahead a replaced my cap and rotor since they are still under warranty. I'm at a loss on this one, and lord know my wife is tired of me spending money! Any help would be greatly appreciated!