Thanks, of course brain's not working today. All plugs sparking. Noted when I put them back in that the revs went up on one when I pushed it in harder. Sprayed more WD40 in that one and now it is idling correctly. Also leads are not sparking. Still misses a bit on acceleration but the main problem appears to be sorting itself out. Looks like that lead may have a connection problem lead to spark plug brought on by the water. Thanks for your help.