Fuel Pump? MAF?
I have been having trouble with my 94 4.0. Sometimes the fuel pump wont kick on (so it wornt start). Other times it will run fine for a while but then while I am driving it will start bucking, kicking in and out of power. I get a dead pedal and loose power.
I thought for sure it was the fuel pump because it wouldn kick on when I turned the key to ignition. Then I went out last night and it did kick on, the truck started runnig bad. So I unplugged the MAF sensor and it started running better. I had changed the MAF last summer but I thought it was defective. I borrowed my brothers MAF and it still runs bad unless I unplug it. Any connection between the MAF and fuel pump? I had gotten to the point where I thought for sure it was the fuel pump, but now that I unplug the MAF I am not sure.
I have already changed the relay and fuel filter. Any suggestions?