What can cause hesitation between 1000-2000 rpm only.. no matter what speed?

Clean throttle body and add some seafoam fuel injector cleaner to gas tank take vehicle on road and hit the passing gear a couple of times this will help clear out any gum and carbon build up in the system.

I cleaned the throttle body and added the seafoam. Drove 55 miles since the effort and no change.

Is the check engine light on ? And did you also replace the fuel filter and check the air filter ?