Hey Guys,

Ive had my Evo for many years now, and I still love it. Except for one thing that has been bothering me since last year. It makes me not even want to drive it.

Im sorry if my story jumps around a bit here, I'm justing trying to get all my thoughts and actions i have done on paper here.

It started last year, during cold starts the cars rpm will go up and down almost to the point of shutting off until the temperature needle moves. it will then idle fine. Cruising down the road until fully warm the afr is perfect during cruising. UNTIL the car is fully warm, the wideband will then go fully lean and the car will stutter. As soon as i touch the throttle the afr goes back to normal and the car runs very smooth, even at wot the afr is good. another symptom is when it is fully warm the rpm will rise to 1200-1300 from the normal 1000. I went ahead and purchased some things this winter and installed them hoping i could cure the issue.

1. egr delete and tapped head (to remove any vacuum leaks or any other ill symptoms of the erg.) (also it was tuned with tephra v7 and i went in and disable the egr codes)
2. spoolinup cop
3. throttle body shaft seals
4. routine boost leak test

Still the issue appears. I'm not sure if the problem persists in the tune or something mechanical which is why i am reluctant to bring it for a retune. It was previously tuned by a local evo guru three years ago and made 525whp. i cleaned my maf, changed my front o2 sensor, and I've read and read on here and am unable to find a solution. is there any logs i can do or upload my graphs to show my tune in order for someone to help me?

mods that matter are
fp black
synapse bov
gsc s2's
ets fmic
no engine codes!

any help is appreciated guys!