over the past few days my s60 has been running pretty rough at idle and when accelerating. i changed the spark plugs today, however it is still doing the same thing. i got the check engine code read at auto zone and it said cylinder 4 misfire. should i replace the cylinder 4 coil pack? or try something else first?

 

Hello! It seems to me that your car might have "brain" problems. It is better to go to the service and have computer check.

Regards,

 

I replaced the number 4 coil pack and it runs great again!

 

Glad to hear that!
Good luck