Just a bit of background, I retired from Mazda as a Master Tech and a service guild member 12 years ago. I know my way around and don't appreciate being talked down to. Now with that behind us, My daughter's 2013 CX-5 Sport is throwing a P0304 #4 misfire. So I do the logical things, like clean the MAF sensor, replace the plugs with OEM, and replace the coil with OEM. No change. Sprayed around the intake and monitored O2s couldn't see much change. Then while driving CEL comes on again and the engine has no power and dash lights come on and CE starts flashing. The engine has only been running for about 5 min. Shut off the engine and restart. now the engine is smooth and dash lights are out. I'm leaning towards EGR or possibly lifter. So before I jump in and start ripping things apart, I thought I'd run it by here. Thanks for taking the time to read.