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[Malcolm_D]

i have an annoying misfire on my 02 2.6 Hasn’t been used since I changed the timing belt etc a couple of months ago, it started fine after that and seemed to run ok.
I have checked and rechecked all of the connections which would have been disturbed during this job, all appear ok. I have also replaced the spark plugs on cylinders 2, 4, and 6, I did the other three not long ago.
When I start her up there is no misfire, a gentle increase of revs and still no misfire, allow her to drop back to idle and she ticks over nicely for a couple of seconds but the the misfire appears. A quick blip of the throttle up to 2000 rpm and the misfire is obvious.
I have done the pedal trick and the codes are 1650, 0650, 0460 and 0330.
Any ideas / suggestions?

[deviator]

I'd start by checking the plugs for signs of water or oil.

[Enceladus]

I have done the pedal trick and the codes are 1650, 0650, 0460 and 0330.

P0330 as per above or is it P0300 as per the title of your post?
How long has the car been standing unused? How much is in the tank?
If the plug wells are dry then perhaps the fuel has gone off.

[Malcolm_D]

Sorry, code is 0300 (random misfire)
Plug wells are dry on bank 2, 4 and 6, and I thought they were fine on 1, 3 and 5. When I checked plug well 5 was anything but dry! I cannot understand how there was water down there, fairly sure it was water - clear(ish) and no smell.
Dried it out and the misfire appears to be sorted.
Thanks for your help guys, yet again! 

[Nick W]

Sorry, code is 0300 (random misfire)
Plug wells are dry on bank 2, 4 and 6, and I thought they were fine on 1, 3 and 5. When I checked plug well 5 was anything but dry! I cannot understand how there was water down there, fairly sure it was water - clear(ish) and no smell.
Dried it out and the misfire appears to be sorted.

You have a leaking scuttle. Remove it, clean up any grot, ensure the seals are properly placed, and remove the foam insulation. If that is wet, you've definitely found the fault.