Rick, on the TPS i'm aware of the required voltage range with engine off/ignition on. What figure should i be looking for when driving and start to head for WOT?
You'll have to record the run and play it back unless you have someone with you with a real sharp eye. The TPS, as you know, will start out about .42 volts and theoretically climb until it hits about 4.8 volts, in a linear fashion. In my case, the voltage dropped to 0 in one frame, then went right back up to the 4 volt region in the next frame. The backfire occured at 0 volts. I wouldn't floor the pedal all the way until you figure it out, as I'm sure the back fire can't be helping things. Let us know what you find out.