Truck Repair: 89 chevy suburban hickups, throttle position sensor, sensor tps

Question
My 89 Sub is 2wd, 5.7, throttle body.  It has a new crate engine, rebuilt transmission, new fuel filter, pump and shutoff relay.  When I am in park and I press the gas it seems to rev normally, but as soon as I start to drive it sort of burps or hickups(jerks, feels like it loses gas for a second) then it starts to go again.  It does this consistantly throughout all ranges of speed, but if I romp down on the gas it seems to push through the hickup faster.  I am at a loss, please help me Van the Man.

Answer
Hi Jon,
I assume you have tried the injector cleaners in the gas tank. Maybe even drygas, in case there is any water.
The throttle position sensor on the side of the throttle body is a possibility. It sends the signal to the computer, telling how much gas you want. It does that at the same time you open the throttle plate allowing a large slug of air to enter the engine. If the air hits without the fuel, it will stumble every time.
The sensor,(TPS) is testable with an ohm meter, and some are even adjustable on the throttle body. I would sure test it, but I would also check the fuel pressure and make sure there is at least 13 PSI at the throttle body while the engine is running.
The romping comment kinda points toward the sensor. I just hate to tell someone to replace a possible problem, when it can be checked.
Wire connections to that TPS are also something to check.

One last item I would have you check is the ground wire from the intake manifold to the firewall, on the passengers side. Make sure it is clean and tight.

Good luck,
Van