I have an 04 evo 8 that boosts just fine but between 3k and 5k rpm's it seems to shudder and lose boost, above 5k rpm's though it seems to be just fine. i checked all of the icp but cant figure out what it is. any thoughts would be greatly appreciated!

 

check spark plugs replace just to eliminate the issue. Do boost check.

 

+1

 

It's not this is it?

My crew of saved Gotham City Residents:
someone help please
Boost Leak Sound
3rd gear..6k..no boost..loud vaccum noise
Weird boost problem, please help
boost control problems
Huge problem, please help!
help loud whisle

 

^ I was just about to guess the good old ominous intake snorkel being loose.

 

Thank you everybody for the suggestions i will look into all of them.