Last Saturday night when I kinda got on the throttle, my truck backfired and started missing for a few seconds. It started running normal again after that, I let into a little bit again and the same problem. I was about 2 blocks from my house and I took it easy on home and parked it for the night. I went out the next morning and set the old Diablosport back to factory and it ran fine from then on. Later that night though the SES light came on. I hooked my reader up to it and it gave me a igniton coil b malfunction. cleared the code and all is well since. Yesterday I had the cats taken off and one was clogged up. When I got back to work I installed the Nelson and truck runs like a scalded arsed ape. I am assuming the clogged cat was causing the backfire and miss?