boost missfire

[scottstu39]

Hey everyone
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.

[BAMBAM]

Have you checked your timing belt you should replace that at 60,000. also make sure you are not missing out with the spark, this will kill your engine.

[scottstu39]

I don't think it's the timing belt, though I should replace it. The engine will rev to red line with no problems as long as I don't get on the boost too hard. This also makes me think the spark is OK. Thanks for the suggestions.

[BAMBAM]

Well check for a boost leak then. that is the problem.