Sorry for the long first time post. Spent many hours reading yall's already. 2007 JK with 175,000 miles. I bought it new and for the most part have repaired/replaced whatever problem has come along in those miles. Here is my current unsolvable (to me) issue. I have had a cracked drivers side exhaust manifold (known to me) for a bit but didn't do anything to repair it. Threw a code for a drivers side upstream o2 a few months back, bought new sensor but CEL turned off so never installed new sensor. A couple of weeks ago, new CEL, codes were P0430, P2308 and P0300 and the jeep started running rough, did not want to go much over 40 mph, would shudder around 40 mph and CEL started flashing. Acted identical to a TJ I previously had with a clogged cat and I thought the P0430 code was pointing to a cat. I figured I wasn't going to get anywhere diagnosing with the current exhaust manifolds (unwilling to buy replacements that would crack again) so I ordered new shorty headers, new cats, new o2s, plugs and wires. Installed everything (both manifolds were shot with a couple of bolts already broke off in the heads), cleared the codes and started the Jeep thinking I was ready to go another 175K. Nope, CEL back on but now it only throws the P2308 immediately and sometimes the P0300 after driving it and it runs the same. My next thought was to replace the coil pack but have read a thousand posts of replaced my . . . . but did not fix my issue so I thought I might reach out before I go down that rabbit hole. The Jeep absolutely needed what I have replaced so far. I have the ability to pull live data with my reader but not very good at interpreting the results to chase the P2308 ignition coil 3 secondary circuit- insufficient ionization and the P0300 random misfire. After reading for hours, I am leaning towards my PCM because I can watch all four of my o2s and the upstream's run 0.015 volts, the downstream's not much above 0.00. I have double checked part numbers for correct fit and have cleaned grounds to bat, frame and PCM. Any suggestions are greatly appreciated and I can post pictures of my live data screens if someone needs anything specific. Thanks in advance.