I've got an 05 GC 5.7, i just bought a Predator and installed the 87oct tune. Took it for a drive and it ran like crap, it spit and sputtered and wanted to die. Nothing about it was right about it. Only mod is an airaid intake. Confused and disappointed? Any help? BTW i re-installed factory tune and had to pull neg battery cable for it to reset. For a minute i thought i had really jacked up the Jeep.
If when i reinstall the tune next time i will unplug neg cable after the tune and see if reseting everything the PCM takes the tune. It's hard to do something wrong, its plug and play i realize this thats why i was wondering if it had maybe happened before.
Thats exactly what it felt like, only running on a couple cylinders. I will try it again maybe bump up to 89oct after i fill up. I only untuned it bc of the way it was running and didn't want to explain to the wife.