2001 Jeep Wrangler

Are your plugs getting fouled?
Spray some starting fluid into the intake and see if it tries to start. If not, do a compression test on all cylinders.

87 percent on the TPS? That's clear flood mode which cuts off the injectors. There may be a fault code set too for TPS signal voltage too high. Check the voltages on the three TPS wires. One will be 5.0 volts, one should be 0.2 volts, and the signal wire should read between 0.5 and 4.5 volts, (close to 0.5 volts at idle). If all of them are near 5 volts, there is a break in the ground wire. If only the 5.0 volt feed and signal wires are at 5.0 volts, there is a break in the signal wire inside the connector or sensor. If only the signal wire is wrong, (close to 5 volts), but it changes when you move the throttle, it was turned before it was tightened and is installed incorrectly. That's pretty hard to do.

Gotta get that TPS percentage down closer to ten percent.

I'm a little confused so here's a better test. Put the meter's black lead on the engine block or the battery negative post, and the red lead on the center terminal in the TPS plug. Take three readings, one at idle, one at half throttle, and one at full throttle.

You should find close to 0.5 volts at idle and close to 4.5 volts at wide open throttle. The voltage should go up and down smoothly as you move the throttle. If it does, both other wires have to be good.

Since you have a scanner, you should see the same change in voltage when you view live sensor data. If you do, there is something we aren't interpretting correctly about that 87 percent.

Okay, I just finished copying diagrams from the Chrysler web site one page at a time! The wire you're after is the orange / dark blue. You should find very low voltage at idle and close to 4.5 volts at wide-open-throttle. If you do not, check how it is mounted and check for 0.2 volts on the black / light blue and 5.0 volts on the orange wire. If all of those voltages are correct, there is no problem with the sensor itself. You should see the same voltage change on the scanner. If the scanner shows 5.0 volts all the time or close to it, there has to be a break in the orange / dark blue wire.

Hold the phone. Thank you for the kind words, but tell me again exactly what you found. What had the shiny spot? Which bolt did you loosen, and how did the cruise control play into this? Gotta add this to my memory banks.

Good job. Happy to hear you're all set to buzz off into the sunset.