1991 Chevrolet K1500, 4.3 V6, TBI. Was cutting out. Mechanic checked the fuel pressure by hooking into the fuel line at the fuel filter. Pressure was low. Installed new fuel pump. Since then, vehicle has been hard starting, needing to pump the accelerator and crank the engine longer than usual. What else might be the issue? I just replaced plugs, rotor and cap prior to replacing the fuel pump.