I have a 2003 Evo that I auto X and take to the track a couple of times a year. I,ve got Works camber plates, rear sway bar and clutch. I like how all the parts perform except the clutch which works fine for performance driving but is a little hard to modulate for street driving. Now my problem. I have 58k miles on the odo and am noticing a miss or hesitation on hard acceleration. Around 4000 rpm under full boost the engine will stop just for a second then rev some more then stop and so on untill I back of the gas. It's not like hitting the rev limiter. I changed the plugs but the problem persists. Is it the boost controler/pop off valve or what? Any help would be greatly appreciated.