hey guys i got a evo 8 which is throwing high idle code its idling around 1200-1600 and surges when slowing down when not it gear. it also throwing insufficient egr flow and multiple random misfire. it has not vacuum leaks and i have replaced the iac, map.
mods
exedy twin disk clutch
comp 280 cams
megan racing exhaust manifold
hks high flow intake
hks turboback exhaust
hks turbo timer.
oh when im really getting on it it becomes to rich right when i first shift into second and stall out for a sec or two then it comes too and runs amazing,
before i bought the car it hasd a meth kit in it btw if thats any help

 

ummm what your tune look like to compensate for the cams?

 

as far as i know it is stock, i bought he car with all the major mods to it already done.
all i have done it brought the visual appeal back and tune up and what not.

i know it most likely needs it but i dont think it will fix all my problems. i figure the misfire is the cams ,maybe even the high idle, but i dont think the egr problem is.., i removed my intake manifold to check for a clog but its as clean as can be

 

check for vacum leak around the injectors or anywhere after the TB

 

Check the egr to make sure all the hoses are on. They like to pop off. I did that and the egr code is gone. If u need a new egr let me no i have one

 

it could be your intake ??? i have an HKS intake and it my idle is all over the place... sometimes it stalls out.. i really need a better tune. I also am throwing an EGR code for which reason i dont know. im starting to think its my intake