Well, i've been having this problem for a little while now, luckily i do have a different vehicle i can drive, so it hasnt killed me yet. But, my 90 cherokee has been acting up when i put it in gear, and try to drive. It sounds like its back firing and has no power. This isnt the problem in the slightest when in neutral, it will rev just fine, although it does idle a little rough. I replaced the fuel pump about two months ago, and when this problem started, i went and replaced my fuel filter and my throttle position sensor. Im not quite sure where to try next to fix it. The difference in the input/output voltage on the TPS is .831, i set that today so and i was told that .83 was where you wanted it to be. Any information, or guidance would be greatly appreciated guys. Thanks alot!

Bryon