Engine Performance problem
1990 Ford F250 V8 Four Wheel Drive Automatic
----------------------------------------------------------------
My 1990 F250 has a 460 gasoline engine.

Runs fine when it's cold, but as it warms up the power falls way off. I can only do 25mph on a flat highway.

Doesn't buck or stall; just step on the pedal and nothing happens.

When it's warmed up it still starts and idles just fine. Just makes no power.