The truck was running fine. No codes. When stopping such as at a stop sign the truck will not go. I can push the pedal to the floor. The RPMs do not go up. After a few seconds, I let off the gas pedal and it will move forward some then rev up to about 3000 rpm, then back down, and then drive normally. I only notice this after it is warm. It has no issue until I stop again at the next stop. If I slow down but do not stop it has no issue speeding up again.
I am not even sure what to check to see what is causing this issue.

2006 F150 5.4 EXT cab Lariet.

 

You are going to want a scanner with live data and compare throttle pedal and throttle body position and desired position. You could be having an issue with either the pedal or the throttle body.

-Dan F

 

This seems like good advice to me. Going to require troubleshooting and that's probably the place to start.

 

it revs to 3000 rpm's while in drive and don't move ? tranny slipping.

 

Is it worse when cold? If so (actually do this anyway) check transmission fluid level.