Truck hesitating when maintaining any speed
 

Ever since i got my truck out of the shop it has been hesitating or jerking while maintaining any speed. Not while accelerating or slowing down, just when i hold the pedal. Here lately it has been getting worse. Before it was in the shop i didn't have this problem.

What they replaced:

Timing Belt
Serpintene Belt
Spark plugs/wires
O2 sensors

^^and i believe thats it although it seemed like more...

Any help would be greatly appreciated.

Clean your maf. Electronics cleaner or alcohol.

is it downshifting, then shifting back multiple times?

Manual Tranny