When you guys with the 5.4 shift from 1st to 2nd, when your truck is cold, what do you rev down to at normal throttle? My truck is reving down below 1000rpms and it feels like I'm losing power... I changed my TPS and i thought that helped and it seemed like it did at first, but now it still seems to be acting weird... This only happens when the truck is cold, when it warms up it shifts great...

 

Yeah... we're gonna need a coversheet on those TPS reports from now on...

 

To rule out the edge have you tried the stock tune? When its cold monitor the transmission speeds (in and out) and compare them. That will be how much your TC is slipping over your tranny and you could tell you if there is a prob with the tune letting the TC slip too much when cold. It shouldn't be a direct TC prob if it shifts fine when warm.

If you do try the stock tune and everything works fine i would get the tranny flushed w/ a filter.

 

it still does it on stock...