Hesitation at higher speeds. Feels like

I would start with a transmission flush and filter change.

which engine? is traNS AUTOMATIC OR STICk?
IS TRANS STUCK IN 1ST GEAR?>
hot or cold? or both (engine temp)
is transmission slipping? (if stick clutch slip)
(eg: engine rpm races, and speed dont increase) called slip.
is it slipping?
or is engine misfiring? (tune up, times skipped?)
or is engine bogging, (feels like dragging 10,000 pounds)?
the engine light means, (get car serviced now)
or if savvy and a DIY person, it means SCAN it now.
easy huh>?

its trying to talk to you, so listen to it and scan it.
then post the DTC errors.
keep in mind we are deaf and blind here. so miss 99% of all key facts, and evidence on car. that your living mechanic sees , feels and hears.,
so dont expect magic here, there will never be that, here.

Sounds like your spark plugs need replaced. ( long shot answer)

Since the transmission shifting and torque converter lock (cruise speeds) up are computer controlled you need to have a scanner hooked up that can read Transmission control module (TCM) fault codes. Also check for engine codes as this could be a misfire, but in that case the check engine light should be flashing while the engine is misfiring and set a fault code. If no codes of any kind are present in memory when the testing is done you almost certainly have a mechanical fault in the transmission like a malfunctioning torque converter clutch, but even that should set a fault code, so have the testing done.

Are you certain that it is the transmission and not the engine misfiring? I would recommend scanning your onboard computer network to BEGIN proper diagnosis.

well it is a missfire the timing may be the issue here

Your transmission is probably jumping in and out of "torque converter lockup". The lockup is the most efficient mode because 100% of the power from the engine goes to the wheels and is not lost in the torque converter. It only goes into lockup at higher speeds, but will jump out if the computer senses it needs more power (at the higher engine RPMs) to maintain or increase your speed. I recommend either going faster or slower if this is bothering you. :-)

Actually, this is normal. To 'kick down' the gear in the transmission, you should go WOT or wide open throttle.

4 cylinder motors seem to feel weaker than v-8's and are tuned to the transmission to rev higher to accomplish a certain acceleration point.

Good luck on driving.

drain your transmission,and while you have the pan off,replace the transmission filter. refill to level specs. also replace the air filter and pcv valve.

you most likely have a coil pack going bad.
This can cause an electrical spike and cause computers to reboot just like your home PC in and electrical storm,that is why the transmission acts as if it does not know which gear to go in.
You need to have someone hook up a scan tool and retrieve the trouble codes and see if there is a miss-fire code stored in memory.