2005 f150 ill put it in drive and it doesnt move by it self, i have to hit the gas to get it to move and it jerks then starts moveing. then after that every thing is fine driveing and question what it could be?

 

Stuck caliper? Mine has done that before.

 

Seized caliper or collapsed flex line.

 

nothing with the breaks thoes are all good. it jerks as in like the tranny or something

 

its like i have no power. i couldnt even spin tires in the dirt

 

How many miles and what engine?

 

says 104k and 4.6
but it wasnt the orginal motor

 

bumnp

 

How sure are you it's not the caliper? This sounds like a classic case of a caliper going bad. Go out and take it for a fifteen minute drive, come back and check for heat on your wheels. If you have a stuck caliper, that wheel will get much hotter than the rest.

 

because if it was a caliper i wouldnt feel a clunk when i first step on the gas