can any one help just got a 98 accord was running good then started to get a missfire on number 3 piston changed plugs,new wires ,and cap and it has good spark so moved the injector to see if that was it but no go still miss fire on #3 car has 210000km o and looks like it is smoking a bit but its white smoke but not loosing any antifrezz or oil any ideas would be great thanks o and for some reason it seemed to get a lot worse when i changed the oil and filter so any ideas any one please

 

chk compression ,,