Focus 2003 Misfiring

[Youngy2005]

hi all iv just bought my first focus its a mk1 2003 but i only bought it as a spare of the moment thing because the owner said it had a miss fire,so I changed the plugs leads and coil and still the same but Iv been reading and everything points to a sticky valve so what do you guys thinks and is it easy to do if it is

thanks

[Dan62]

How severe is the misfire, does it do it at idle, when revving or when accelerating ?

Have you tried re-gaping the spark plugs to 1.0mm ?

[Youngy2005]

It does it most when on idle but as Iv only just got the car I'm not sure if it's down on power but it feels like it