No power under acceleration

[ghalleen]

I have an 03 6.0 liter F-350 that has recently lost all power anytime I press the accelerator past 1/3 down. If I pump the throttle, I can keep acceleration but otherwise it acts like there is no fuel.

I've replaced both fuel filters already.

Any thoughts on what might be wrong?

No smoke is visible.

Thanks!

[ghalleen]

Other info on the truck:

125,000 miles
Regular service at Ford dealership
K&N air intake
4" exhaust

No leaks, smoke, or funny noises.
Turbo was replaced 1-1/2 years ago by Ford.

[quequeg37]

you have access to a scanner to pull codes. That's usually the best place to start. Could have something to do with the throttle position sensor but its just guess-work until you have some codes pulled.

[ghalleen]

Problem solved! See the solution posted in the Motor problems forum:

Out of Power on acceleration