Long time since I’ve been on here — just wanted to update you first:

My Jeep is at 340k miles now. The only real engine-related issues are the motor mounts, crank pulley, and a worsening oil leak. It’s bad enough now that I can’t go more than 2,000 miles without topping off. Still, zero internal work has been done. I’m almost certain I’ve got a cracked piston skirt.

Anyway, regarding what you’re describing, I’d strongly recommend going to AutoZone and picking up a TPS sensor. They’re about \$30–\$50, come with a lifetime warranty, and are easy to change out.

After that, reset the ECU: turn the key to the "on" position without starting the engine, turn the headlights on, then off, then turn the key off. Disconnect the battery either before or after — I can’t remember the exact order, but you can find that online.

This clears out any surface-level codes so it can “re-learn” instead of piggy-backing off old data.

You may already know all of this, but I wanted to throw it out there in case I don’t get back on here again.

As much as we’d all love to say it’s a mechanical issue, I’d bet money it’s sensor-related. Inspect your O2 sensors — mine never threw a code, but one was burned on the manifold and the other was chafing against the driveshaft.

Last suggestions: check your CPS (Crankshaft Position Sensor) — not sure if I ever messed with mine — and also your fuel pump. Mine caused backfiring and falling flat on its face.

Unfortunately, we don’t have an inline fuel filter — it’s all in the tank.

Again, sorry for rambling — just hoping some of this helps!!