HELP! My Car is due a service - which is going to be done this week, but i just want to put my mind at rest that it's nothing serious really........... When i got in the car this morning and started it up from Cold, it was really lumpy and idling around 900rpm, it felt like it wasn't firing on all cylinders, if i raised the revs slightly it would go away just above 1k rpm, but driving up the road shortly afterwards it was still doing it I even got a couple of small reasonably quiet pops where it sounds like it's misfiring. Is this likely to be cured simply by replacing the Leads and Plugs? Or