Its a BF typhoon motor (not that makes much difference) 600rwkw atomic build, all custom intercool and intake (simlar to the Type R) new 84cc VDO injectors, top mount 35/40 high flowed, with a t56 mal wood close ratio box with his twin plate clutch to suit with 3.91 diff ratio, going to run E85 but want to sort this problem before dyno :( its not miss fire. When is was retuned nothing came up on the computer to say there was any det issues. Something feels out of balance...