I noticed mine does the same but only after long trips on the interstate. Drives the same just figured something gets warmer than usual

 

Stock cams in mine. It use to read about 19 at idle, now about 9-10

 

I have aftermarket cams and still read 15 at idle. If you're only reading 10 that seems awful high. I've always had Evo's between 14 and 20

 

I know its high and i don't think i have a bost leak cuz i hold 24psi just fine

 

Maybe I'm mistaken but if you have a hose leak on one of the smaller lines your vacuum would read lower due to the lost pressure from a leaky hose. you might want to check vacuum lines on throttle body as mine used to blow off and I would not boost above 24-25 psi. Zip tied the line and all is good.

I'm not saying this is your problem in so much as something to check out.

pretty sure I'm around 19psi vacuum at idle

 

Yeah i'll check it out, cuz the boostin isn't the issue. I just don't see with stock cams that it should read that high in the vacuum

 

I would do a boost test for sure because you can still boost with a leak its just your turbo works alot harder and you loose metered air with the leak so you loose power because your afr are off

 

I know about that but afr's are dead on as well.

 

do you have cams? if so its normal!

 

I am having same issue, this is my first EVO, but not my first 4g63, let me know how things work out, im thinking I have some vacuum lines hooked up wrong, let me know how things work out for you. I will let you know if I find something out.