99 ZR 500 EFI has a cutting out problem at WOT. The problem is totally intermitent. It will rev to about 7500 like normal then it will just stay there. Did a plug chop during the bog and left plug was wet and dark and right plug had a nearly white insulator. Started it back up and it revved right out like normal. It runs perfect until it hits about 7500 rpm each time it bogs. It also wasn''t starting on 2 pulls everytime. Any ideas what would cause it to drop a cylinder at wot? TPS? thanks in advance