When I bought my 89 it lost fuel supply due to rust particles. after two pickup screens for the pump and dropping the tank twice, i left the pickup screen off and let the rust particle go directly to the filter. atefr it started sputtering the otehr day I removed a 5 pound rust filled fuel filter and replaced it, and the air filter. the truck runs great but stopped at traffic lights it sputters and dies. starts back up after a second like nothing is wrong. This is really frustrating please help.