Tune or install problem?

EVOHUNTER

I purchased a stillen v3 kit, it was installed. I used the stillen can tune until i was able to get a proper tune. After the tune - get power! getting great boost. Still have a hot start issue, which is easly fixed, but my main problem.
My idle - it'll dip low on the rpm, but this happens when my car drops my AFR to about 10.5 at idle. It jumps around and doesnt sit still. Should it idle at the same afr? everytime? Also coming up to a light do 40mph, take the car out of gear and coast to the light, my afr drops to 10 and will bog out inless i give it a shot of gas, then it jumps back to 14-15afr and idles fine. In colder weather, car runs great, does the idle thing once in a while.
So considering the stillen can tuned never idled bad, just had no power, im leaning towards the tune? Thanks in advance.

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