Juddery start - Misfire?

Ok,



This doesn't happen too often but the car is a bit rough when firing up about 50% of the time. Worse from cold.



This morning however it was juddery, very unsettled. After I drive off it does settle down but its really starting to worry me as this doesn't sound right.



I did a service just last week! (Oil, Oil Filter, Air Filter, Spark Plugs)



I'm going to be putting some Wynn's Tappet cleaner in sometime in the next week as it can be a little tappy, but I highly doubt that's what the issue is.



Any thoughts?



I'm wondering if maybe the coil pack/HT leads are on their last legs? It's worse when its cold.

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