I have a 2004 coupe just did wires and plugs Bc the car had a mis and was throwing multiple misfire codes, The misfire codes are gone but now it’s back firing thru the mass airflow I can here what sounds like a pop that’s happening here and there. Also the car is running rough and trying to stall out the rpms are under 500 rpms. Can’t figure this out help. I did new wires new plugs, replace fuel filter, some vacuum hoses, new mass air flow. And also the exhaust is getting really hot fast I’m thinking maybe clogged cats?