Exhaust manifold glows red and truj won't get above 60. Wat causes this? on 1994 Ford F-350

Truck jut got out of a transmission rebuild and engines was runnin great before and now overheats and won't go over a certain speed and needs high RPMs to change gears.

Asked by for the 1994 Ford F-350
1 answer
sounds like you have a plugged converter