Hello friends! Hoping to get a little help here. I've had a persistent problem with my 89 Rangie “misfiring” when warm. I put misfire in quotes because it’s not really a misfire but more like all cylinders shut down for a second under load.
She starts right up and idles nicely. Runs pretty well for the first 4 miles or so but when it warms up (normal operating temp) it "misfires" under load-when I hit the throttle to get up a hill. The EFI light will stay off until it hits that shut-down stumble then it comes on until I clear it by removing a battery cable from the terminal. So far I've replaced the fuel pump, coil, coolant temp sensor, added a new alternator, distributor cap and rotor and still problem remains. I'm at the end of my rope of things to try. Any suggestions? Your help is very Much appreciated!