what can cause a skip in the engine? on 1997 Toyota Camry

the code read a misfire in plug #4 and we change it,still have the same problem. what to do now?

Asked by for the 1997 Toyota Camry
Plug wire or ignition coil for that cylinder think it also fires # 1 cyl.
Good tune will prob. fix this!
1 more answer
maybe you need a tune-up