P0301 & P0304 error codes ???

Question

I have a 2007 Chevy Aveo, I gotcheck egine light is on, P0301 & P0304 error codes but there is no misfire in the car, I did pressure test on all 4 cylenders and it came out to be good , I changed the spark plugs and wires???

Answer 1

Misfire number 1 cylinder and misfire number 4 cyclinder, 1 and 4 are companion cylinder for the ignition coil this is more than likely a failed ignition coil pack.