I have a 2000 TJ 4.0 with the single cat. I had what I believed was a heat soak issue. I installed the DEI insulation kit and things seemed to be better. But here is my current issue. When my engine gets hot, I notice a rough idle and a loss of power at higher speed/higher RPMs. I also have occasional issues restarting the engine when hot. Just yesterday, I ran into the store after driving for 20 minutes. When I tried restarting the engine, it sputtered like a heat soak issue and then died. After several attempts, the engine would not start. I let it sit to cool down for about 15 minutes and then it finally fired right up. After that I once again noticed a loss of power at higher rpms and speed. I do not have any codes but the catalytic monitor will not pass. I meant to check if the cat was red this morning after driving to work but I forgot to check it. Does this sound like a bad cat?
Kevin
Kevin