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[N61AOP]

I've had problems with water leaking in to #4 plug on my 2.2 CD auto. The leaks been sealed, new rocker cover and new coil pack. Everything seems to be fine except when starting from cold it runs very rough for a few seconds before settling down. Doesn't always do this, but more often than not it does. Sometimes it sounds like it's going to cut out and I expect the warning light to come on, but so far this hasn't happened. Once it's warmed up it seems to be running smoothly but on a trip to Cornwall with a full load a couple of weeks ago I thought I could detect a slight misfire when the engine was working hard (ie. going up hills on the A30!). Coil pack and rocker cover was replaced about three weeks ago and it's been like this since then. Any ideas?

[ronnyd]

Plugs?

[N61AOP]

Been checked over and apparently all OK but could be one starting to fail.

[ronnyd]

Do you have any idea how long they have been in there?

[RobG]

Any coolant loss?

[plym ian]

Was it a genuine coil pack?

[N61AOP]

Yes, genuine VX coil pack, and no coolant loss. I have no idea how long the plugs have been in there. I have had the car 5 years and done 40k miles, and can't remember having the plugs replaced in that time.