I have a 98 F150 Supercab and the power window on the drivers side rolls down fast at first then bogs almost to a dead stop through the middle and towards the end rolls down fast again....on the way up it rolls normal all the way up ....any ideas...thanks guys...

 

Replace the lift motor.

 

My 97 would slow up a bit from time to time... I sprayed some silacone speay in the track up and down on each side and it help greatly!
Learned that trick from my 93 ****box!