No throttle response on a 1993 B2600i

I have a 1993 B2600i that would not start, replaced coil to get spark, replaced distributer assembly(used part), replaced ECU with a re-manufactured ECU. Truck now starts and idles but you can push the throttle to the floor and it does nothing more than idle. Tried dropping the exhaust before the converter, same issue. Checked air filter, not plugged. I can unplug the MAF and TPS sensors and it doesn't change...just idles with no SES light. Any ideas???

Seems the TPS switch is bad if it doesn't sense coming off idle. Unplugging it would simulate it being "unable to sense coming off idle."

Maybe cleaning the switch contacts would help. Using a multimeter to verify changestate definately would.

Broken throttle cable?
If the throttle was wide open, the engine would not continue to idle... it would die.