I recently removed my engine to clean the intake valves because I was getting an engine light. Everything went smooth and had the engine back in 2 days. I installed bhr coils/msd wires/ngk plugs. I confirmed the firing order and wire locations. The car runs but I'm almost getting a misfire feel where it pops randomly and when I press on the accelerator it bogs down and dies. I did a throttle body relearn procedure and just to be safe installed the factory plugs and wires and had no change. The only engine code I'm getting now is a rear O2 sensor code which is correct since I installed a new full exhaust and have a cat delete. When I have it running and I give it gas enough where it doesn't shut off it will rev fine but the engine light flashes but still gives no codes. This is where I'm stuck besides the exhaust everything else is stock. Any help will be appreciated and by all means ask me anything so I can help narrow this down.