i recently had my evo tuned by martin at ams and everything is great except for two things. On a cold start up my idel fluctuates and idles down so low that it dies a few times. I would assume that this is a quick fix considering it was not like that before the tune.
Next is a boost problem. in 2nd and third gear while around 15 psi if i let of the gas to shift gears or to slow down the waste gate seems like it stays open for a second or two.
i have aem ems.
I have yet to contact martin but i thought i would just throw this out there and see if you guys have any suggestions.

thanx

 

These two things might be indicating a small vacuum leak somewhere, boost leak test your system. Do you have a WB? Can you share a log of the car idling? how much vacuum are you seeing at idle?