Is the PCM setting any codes?
Make sure the maf is plugged in and actually working.

How's the valvetrain sound?

Since the truck is idling ok, that tells me the pcm is working correctly.

It's possible the cam and crank dots weren't lined up during the install.

If it's idling ok and the truck runs ok during normal driving, but sux under aggressive driving, the pcm may be detecting a bunch of knock retard and pulling lots of timing.

just a few things to check, hope you get it figured out,

allen