Misfire in Cylinder 4

[mjurado863]

Ok I need major help. So my check engine light went on a month ago. Since then I replaced the exhaust and intake solenoids due to a p0010, p0012, p0014. After those codes went away I realized the car was still idling very roughly so I read the engine codes again and this time got a misfire in cylinder 4 code and a random misfire. So then I changed all spark plugs and boots. Still had a misfire. So then I checked all ignition coils and all of them are good. WHAT DO I DO NEXT????? Oh and after I had replaced the intake and exhaust solenoids my ABS traction control light turned on due to a problem.

 

[06cobaltt]

You need to get a leak down test done on the cylinder head. The ecotechs love to burn valves. I had the same thing happen to me and it was a burnt exhaust valve in cylinder #4. Ended up pulling the head off and having it rebuilt. When I put it back together I also installed a new timing chain, cam gears, guides and tensioners.