have a 94 gmc jimmy4x4 4.3 vortex engine.the car ran fine then it wounld,nt star

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spray some carb cleaner into the air intake hose had anothperson crank engine ,engine finally started ran fine when 20 miles and stop car again .came to start car and had same problem,had rubber mallet and ligthly hit fuel filter then phelum on engine car finally started drove home.next day had same problem.change fuel pump and relay.shop said they ran another wire from tank ground to ground on fuel relay.car ran fine for a few days then,woundt,t start again changed sparkplug and wires cap,rotor,still has code 54 (fuel circuit problem)car runs but has a miss that I can fine,can you help