The fuel pump went out and it was replaced with a new one. I was told that the fuel filter neede replacement but did not have the funds to do it. The problem only happens when holding the brake or just idling. It is not as bad when you take the vehicle of drive gear.
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The power through the fuse is to the fuel pump, this only runs long enough to pressure the fuel behind the injectors so that when they open the fuel is an high pressure. So you will normally hear it when you put the key in and turn it, before you start the engine, and then while driving it will be on. Your fuel pump is running longer than usual, because the fuel is not getting up to sufficient pressure. This would also account for the poor running. If you do not have fuel leaking all over the floor, the first thing to replace is the fuel filter. These get dirty over time, especially if you ran the tank dry in recent months. If its blocked the fuel pump tries hard to suck fuel from the tank through it and fails.
Lets start at the beginning. Did anyone check fuel pressure before and after replacing the pump ? Has anyone checked the fuel pressure regulator and the injector spider ? The 4.3w engine uses a spider with one injector that supplies all 6 cylinders. And it runs at 65psi or more.
1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.
You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.
ENGINE LOPING CAUSED BY.LEAKING BY VACUUM LEAKS AT THE INTAKE MANIFOLD.CHECK ALL BOLTS ON THE INTAKE MANIFOLD TO MAKE SURE THEY TIGHT.YOU COULD HAVE LEAKING EGR VALVE OR PLUGGED PVC VALVE.DO A COMPRESSION TEST TO CHECK FOR LEAKING HEAD GASKET.DO A FUEL PUMP TEST CHECK FUEL PRESSURE.IT SHOULD BE 35 - 45 PSI.IF FUEL FILTER HAS NOT BEEN REPLACED.REPLACE IT FIRST IF FUEL PRESSURE TO LOW.DIRTY FUEL INJECTORS WILL CAUSE LOPING.TIMING CHAIN WORN.IGNITION TIMING OFF AND WORN LEAKING VALVES.AND WORN CAMSHAFT LOBES.ALL ABOVE WILL CAUSE ENGINE LOPING OR SHAKING.