What about the TPS? When the problem is acting up, if you punch the pedal to the floor it jumps and accelerates just fine, but as soon as you let the pedal slightly off the floor it starts stumbling and bogging.
Does the ECU go into a closed loop( no readings from 02 sensors) when you go full throttle? My cobra does, just didnt know if my truck functions the same way.

-1989 4x4 22re(pretty good in the mud)
- custom steel flat bed-oneside of exhaust system, and air box intake off cobra.(doesnt quite have the v8 rumble)AFM off '82 Supra.
-Destination M/T 31"-KYB monomax shocks-"add a leaf"