'91 nissan pathfinder SE missfiring

[lyonsden1980]

3.0 V6, new spark plugs, cap and rotor, coil, fuel filter. Started loosing power and 2 days later it will start and idol on maybe 3 cylinders, if I flutter the gas pettal it will rev up but when held at high rpm's it starts missing.

Gas is flowing but I was told the pump might not be suppling enough pressure. Any advice before I drop my tank?

The fuel filter was 4 months old and already plugged, the gas that came out was black. I also suspected the fuel injectors, or maybe a blown head gasket. I dont know?

Also it doesn't smoke or or make any wird sound like a valve hitting or anything else like that. It does have a SM leak at the exhaust
manifold 2 bolts are missing and 1 one of them someone has done some work to that area, so now i cant get it on, so i just put some "JB Weld" on it, BUT the bolt wont work. Some A$$ had drilled it and
Punctured the water jacket, i think.

[88pathoffroad]

You don't have to drop the tank to get to the fuel pump, there should be an access hole in the cargo area under the carpet. Fuel pressure should be 46 psi or so. Check your ECU error codes and see if anything is stored. Also re-check the plug wires to make sure they're on in the right order and are plugged all the way on. Those things are tough to get in their holes, aren't they? BTW, the firing order is 1-2-3-4-5-6.

[FixUrNissan]

Fuel Pressure is not 46 psi on 91 Path . 36 psi 41 with the return pinched. anyway back to your misfire. Sounds to me like a injector issue. check resistance in injectors. should not be over 11-14 ohm's , if higher .. replace it

[88pathoffroad]

Actually, for the VG30E it's 34 psi at idle and 43 with the FPR vaccuum source removed... My bad. For the VG30i it's 36.3 psi.