I have a 1994 E150 with 121,000 miles on 5.8L. Transmission replaced at
85,000 with factory rebuilt.Idle has very slight roughness, hardly noticeable, then it miss fires hard two or three times. Then a another minute or two of comparatively smooth idle.
While going 60 mph it runs good and then it cuts out, causes a lurch.
New parts and work done at pretty decent shop. plugs, wires, rotor, distributor cap, coil, fuel filter & ignition module injectors cleaned at diesel shop fuel pressure checked ok and steady after injectors cleaned
Runs better but the hard miss/stumble is still there.
Any ideas out there would help
Thanks David