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Coil pack problems or maybe loom?

This is a bit of an odd one.

Last year I has a misfire on one of the cylinders. After pulling the offending coil pack off, testing the voltage and resistance across parts in that area and checking the spark plug everything looked good. I replaced the spark plug, as I couldn’t find an issue, screwed everything back together and all was fine. That was it for the year and the issue didn’t reoccur.

The other day, when I pulled the car out for it’s MOT, there was another misfire on a different cylinder. This time I thought that I’d just pull the coil pack and pop it back in. Bingo, it cured the misfire.

Today I pulled the car out and the misfire was back but on another cylinder! ? Again I just popped the offending coil off and put it on again and the problem was gone.

Any ideas what’s going on here?

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    24 minutes ago, Gaz 300 said:

    Maybe needs a good long drive. Do you drive it often Chris?

    Hi Gaz

    Not really, no. I done about 600 miles last year. ?‍♂️ But when I do drive it she’s out for a good drive and gets fully warmed up.

    I was wondering if there’s some sort of contact grease that’s ok to use with coil packs to help continuity with it and the top of the spark plug?

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