So, I've got a 96 Cherokee. The other day after driving for several hours, it threw a CEL (P0420, Cat system efficiency below threshold bank 1). I cleared the code and it hasn't come back on. But, I have been feeling a slight loss in power. Its not huge, and there's a possibility its in my head, but its much quicker to downshift on the interstate and what not. I'm wondering if the Cat is clogged, and what would happen if i just emptied the cat. Have done this on previous (non OBDII) vehicles with success. Will it throw a CEL? Are there any other options? Thanks