P0305 engine light

Question

We changed the spark plug and the ignition coil.The car shaking around 3000 sped. What's make the shaking,what we can change more?
Thanks

Answer 1

P0305 Misfire number 5 cylinder,

A misfire can be from ignition coil, sparkplug boot, injector or even mechanical,what needs to be done is a compression test, Not only should a compression test be performed but a leak down on that particular cylinder