Q&A

 Master

you cant replace a cyl. i rec you do a compression test and see if the problem is internal or an external problem. if your compression is good you may have wiring,coil or electrical problem

 Master

An engine misfire can be caused by engine mechanical issues, fuel issues, or ignition issues. You've got to start with the basics, check the engine is mechanically sound (good even compression, no vacuum leaks,valves are properly adjusted (in the case of shim or screw adjusted valve clearances), check the engine's ignition system is good (good spark plugs coils or plug wires where applicable) then the fuel system needs to be tested and inspected to make sure it is operating efficiently. A misfire can be caused by many things but basic diagnostic tests need to be done rather than just trying to guess what the problem is.