Hey, HEY NOW!!!! I've been busy guys....and mostly separated from my MJ for the past almost 2 years. Focusing on my other project since I'm on assignment in Georgia (Pete, I'm in Snellville every weekend until August, fyi).
This is my response to HC's message if I ever fixed my problem:
I absolutely did. I had a bad solder joint in the wiring harness. The CPU sends a 5VDC signal to both the TPS and the IAC from the same wire which splits right above the valve cover in the main harness loom.
You can test this pretty easily with a decent multimeter and a piercing probe (link below). Figure out which wire is +5VDC from your computer to each of those sensors (I had +5V DC on each one as long as it was unplugged). Key on should be able to find this.
Next, hook the piercing probe to the wire (should still get +5VDC). Hook the connector back up to the sensor and start the engine. Check voltage (rev the motor a bit too just to see if there's any change). Do the same for the other sensor.
If the voltage drops below maybe 4.96VDC on either one you likely have a problem. Mine dropped to 1.77VDC with the engine running but if I unplugged one of the sensors it jumped back up to 5VDC. You should also check the voltage coming from the ECU to make sure that it is +5VDC.....I want to say it's pin 26 but that's going strictly off memory and it's been a few years since I had any issues with this. I'd offer a wiring diagram to help but my books are all with my Jeep in Louisiana and I'm in Georgia on a project at the moment.
Seriously, once I saw the voltage drop it took me 15 minutes to trace out where the two wires came together, unwrap, resolder, and tidy everything back up. I had thrown probably $700 in sensors, fuel injectors, etc in it at that point. Talk about a dumb, easy fix.
Hope this helps, if you have more questions, hit me up. My MJ is separated from me at the moment but I'll tell ya what I can from memory! https://www.amazon.com/dp/B07R8XJWKX/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B07R8XJWKX&pd_rd_w=9T9KT&pf_rd_p=48d372c1-f7e1-4b8b-9d02-4bd86f5158c5&pd_rd_wg=JMSa3&pf_rd_r=TMCHKQMPDWJCZYVG70KJ&pd_rd_r=e6166fb5-859d-4621-91ba-9ae9c33a2823&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzMU1NRldTUEw2TllWJmVuY3J5cHRlZElkPUEwNjc1ODE1UVk2NEtBNVVXRDU4JmVuY3J5cHRlZEFkSWQ9QTAwNDc5NDMxMkhMSFI4S1c1VjEyJndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==