hi, ive just noticed that 2 weeks a go i changed my spark plugs i got a misfiring engine now and it made the cel come on but went out again, i checked the maf sensor was working by unplugging while running and cut out as it should so im thinking coil packs, but dont wanna be shelling out 200 plus quid unless im pretty sure what do you guys think? Thanks.

 

Take each one out, take the rubber boot off and examine for cracks

Change the one that is needed.

 

first things first, check what you changed, plugs can and do break down, also check the gapping is correct.