OK, sometimes I'm a dummy. I was shutting the truck off as I unplugged each connection. then restarting every time. I just went out and checked each connection with the motor running the whole time. Every one got worse till I got to #8. That stayed the same. I pulled the new COP and put an old one back in. Truck sounds fine now. Only now the CEL came on. I'm guessing it was gonna come up because of the bad COP. I disconnected the battery. I'll hook it up in an hour and check it again.