I have a 2000 F350 Powerstroke with Auto transmission that shifts fine as long as I don't accellerate hard. When accellerating hard at the point where it would normally shift it just keeps the same engine speed, no longer accellerates and doesn't shift. Letting up on the accellerator causes it to shift and then continue accelleration. It has around 120K miles. The check engine light hasn't come on. Any ideas as to what might be the cause. I'd think it might be a sensor, but then my expertise isn't a mechanic. Thanks.
- posted
18 years ago