1989 f150 5.0 V8 running on only 3 cylinders, immediate help.
we will cut to the chase its not a leak bad hose/wire evap or throttle sensor. not a clog
in the fuel line. i believe its the fuel regulator. the fuel rail reads 36 psi so i modified my
regulator ( put a washer under the spring inside) and gained 10 psi on the fuel rail. so
far its 46 psi and it did run a little better. I am in need of what the fuel pressure should
be at the rail for my vehicle or anyone else who has experience with this problem.
Spark plugs and wires checked. i can unplug 5 of them without them affecting the
performance. so that leads to only 3 cylinders working. spark plug wires range from
6000-9000 ohms.