Ok so i have been having this problem with my evo and it has slowly gotten worse and now i can't even go full throttle, I can reach boost fine but the second i mash it , it sputters and spits from 4500-around 7k then stops and it does it in every gear, I have checked for leaks, changed spark plugs, adjusted my wastegate actuator arm and now i am at a loss and am afraid of hurting my car. WHAT DO I DO???

 

sounds like when the intake "snorkle" isnt secured down with the two plastic rivets. double check those. while at wot the snorkle will suck up against the hood. hope this helps

 

i am running a cone filter so no snorkel, I am going to try one last thing, then i am at a total loss, try and hook my MBC differantly see how that goes

 

What boost level?

How are you measuring boost?

What plugs and gap?

What AFR, if known?

 

Yeah, sounds related to spark, although you said you switched the plugs. Like Scott asked, what plugs did you install and at what gap? It may also be a good idea to swap out your plug wires with another local Evo just to see if that makes a difference.

When you say you checked for leaks, did you perform an actual pressure test or just "check" for leaks?

 

is it like a rev...then starts to accelerate just not fast ? ... could be clutch

 

He said it sputters and spits.

 

did you make sure the coils are properly seated on the plugs?

Pull the plugs again and make sure the eclectode is tight and there are no crack in the porcelain.