problems

recently plugged about $1500 maintaining 2000 breeze. Everytime i take it to the dealer somethings wrong afterwards. Take it to friend and he does best he can. Recently told one of cylinders is backfiring. being that its four of them, guess im supposed to pick one. Any clue on the costs and if its even worth it. Idiot also told me its not a safety issue. Does one misfiring mess up the whole engine? Open to any answers and suggestions.

I had the same problem. The tubes that are supposed to keep oil from getting near the spark plugs failed, allowing the spark plug and wire to become submerged in engine oil. A quick fix is to pull the plug and let the oil drain into the cylinder from time to time befor it gets to bad. A better fix is to pull the valve cover and seal the tubes. Once you get a mis-fire, you almost need to replace the plug and wire. My problem started after i replaced the head gasket. Apearantly I didn't get the tubes installed oil tight.