I have a 1988 3.0 V6 4x4. The check engine light came on and some work to the pathfinder by putting in new hoses, spark plugs, spark plug wires, and cleaning out gunk and grime. When I put everything back together everything went hay wire. When it turns on, I can't rev over 500 rpms or else I loose power, when I put it in gear, I loose power, and I think it might be the fuel pump, but I'm not sure. The engine light comes on after it stalls but I don't know how to diagnose it since its OBD1.
Any advice?