Well, I live in winter springs Fl. I have perfect timing, new fuel pump, 2 fuel pressure regulators, 2 map sensors, new fuel filter, lines and wires cap rotor plugs, pick up coil and 150 on each cylendar. My 2.5 starts right up and idles fine. As soon as I hit the gas it breaks up and back fires like mad not letting me get over 1700 rpm. This started on a 7 hr trail ride three and a half hrs from home. 15 mph the entire way home. Anyways, the only thing I can think of is the computer is going bad. Before I spend 300 more on the computer I just figured I'd ask my wheeling buddies here on the forum. I need someone that would be willing to meet me at the shop where the jeep is and let me unclip the computer from you're yj and plug it in mine so I can narrow out weither or not it's the cpu. It's obd1 there is no codes to be thrown. The only thing I get from turn key engine light is that the factory a.c. relay is bad, I know this the factory a.c. has been replaced with a new kit from jeepair.com a few months back so I know that has nothing to do with it. No cat and I'm on my third muffler (the back firing was killing them) so thats where I'm at. Well beyone my cool at this point with my jeep. I'll pay $20 bucks for the use it's real quick to disco the c.p.u. I only need it for like 10 min and you can watch at the shop with the mechanic doing it.