Originally Posted by maddog34

the cranks move around under load... there may be an issue with the bottom bracket adjustment or bearings... the crank may have other problems too.

and there's always a chance that the frame or crank is cracked......

other than that, reset the H limit screw, since you probably changed it's setting, when you didn't need to, during a simple cable swap.
there are any large number of vids on the 'tube showing how to reset the high limit screw.
start by making sure the crank -to-spindle bolt is properly torqued, right after you make sure the crank isn't cracked or bent.
you can find proper torque specs for that bolt online.... USE A TORQUE WRENCH, rather than ham-fisting the poor thing to death, ok?

a trek 1220 is, most likely, fitted with a square taper or octalink crank set.... they require different torque specs.
do you know how to tell the difference? the crank may also have been updated to a HT2 Crank and BB

and WHATEVER you do, DO NOT just grab the FD cage and yank on it to "try and align it"... That will RUIN the derailleur.
derailleur alignment and height setting/checking is the third step to properly resetting the H screw.