Curvy idle problem.

Yesterday morning my bike started and ran fine, after work it started and ran fine. Then after doing about 10 miles down the A1 I turned off and pulled up to some lights, my idle dropped to 800 and stayed there. It still pulled away fine and accelerated as normal but idle was really low. I pulled over and switched the bike off just to have a quick look. When I started it up it really struggled and idle was again at around 800, it very slowly made its way back up to 1300. (took about 5 - 10 seconds).

I tried this a few times with the same outcome. Giving it throttle didn't help, still struggled just like it would if the engine was stone cold and you tried giving it throttle. (On a Curvy)

After a further 15 - 20 miles all was fine, idle stayed at 1300, started just fine and was still good this morning. Could it have just been some gunk got lodged in the idle jet or something?

- I currently have Iridium plugs in which have ~10,000 miles on them. Changing them this weekend. But Don't think it they were the cause.