High speed troubles

Situation;
So here's what im working with so you might have an idea whats causing the problem, 96 jeep cherokee 5in lift, 31's, sye, transfercase drop, throttle body spacer, and new engine that i put in myself,

Problem:
When i try to accelerate faster on the highway the car seems to miss fire or something. What happens is the car will lose power then kick, then no pwer then, go and it seems like only one pistons is firing so idk, but i have to drive back out to Crested butte this week and really dont feel safe with out being aable to accelerate and pass a semi

thanks u for any help, i really dont want to pay the dealership 140 just to hook it up to a dino

It is an automatic and the check engine light came on and i think it might be miss firing

TPS would be my guess. a bad spot would cause it to see no signal then signal again causing the sudden jerk and surge feeling

I.m not sure I have the symptoms down but is it this:

Engine startes and idles ok.
Seems to work properly in neutral/low load conditions.
Under load, engine runs fine at a constant speed
step on the gas, engine hesitates(almost seems to die) then surges(may seem to buck a little) then settles down and seems to run fine again.
No noticeable problem when you slow down.

Is that it? Bad TPS(throttle position sensor)

ya but it will keep bucking as long as i step as hard on the pedal

yes it will your not getting the right info to the ecm so it does not know what to do and the jeep acts up when you get out of that spot it clears up and runs normal so it sounds like a bad tps to me.

where is the tps?

throttle body next to the idle air control motor