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Think I got it... Seems there is a short somewhere between the TPS and the PCM. I rewired from the TPS to the PCM, disconnecting the wires in the harness. No more codes, seems to be running great so far. Must be a breakdown somewhere in the harness. Previously, the code would immediately...

Yeah, checking electrical connections now....

'04 Jeep Grand Cherokee Laredo, 4.0L, 128,000 miles. Wife complained yesterday about no acceleration, and "jumpy" feeling in the jeep, I gave her my Wrangler to drive to work, and drove the cherokee home with no issues, other than a CEL code P0122. I changed the TPS, and drove myself back to...

I assume that "won't fire" means that the engine is, at least, turning. I'd start with the rotor and distributor cap. If that doesn't fix the problem, I'd then replace the ignition coil. It's clearly an ignition problem, so I'd bet that one of these items would be an easy fix.

Thanks Tom and Mikey. Yeah, the twofer was unexpected. I traded an '06 F150 for the '04 GC Laredo. I was not looking forward to another winter with RWD. Always wanted 4wd and found a great deal on the Laredo. A couple of weeks later, the wife's '97 Mazda 626 just quit, so I got the '01...

Hey, just an introduction. I'm in Kansas City, MO. Just bought 2 used Jeeps in December '10. Got an '04 Grand Cherokee Laredo, and an '01 Wrangler Sahara. Never owned a Jeep, or 4x4 for that matter. Loving both so far. I've been lurking in the forum for a while, and have found a lot of...