I have a 1993 GMC Sierra K1500 with a 5.7L V8 and when im driving it and let of the gas around town it chugs and sounds like its gonna die. Could it be the screen on my fuel pump is plugged? I replaced the fuel filter about 1000 miles ago and it didnt help and i replaced the plugs, wires, cap, and rotor about a year ago. Any suggestions?