I have a 95 chevy with a 350 it skips about mid range. i put new plugs, wires, egr valve, throttle position sensor. tps was the only code in the ecm.I checked for vacuum leaks and didn't find any. it idles up and down and then it will idle steady. when you hit about 2500 rpm it missis. the truck sit for a while. could it have water in the gas? that's the only thing i can think of. Need help. lbush