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· TT This
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what do you have for fuel upgrades? Fuel management? injector sizes?

My car has never idled smooth like it did stock and I don't think it ever will again. The shuttering your feeling is most likely the engine being starved of fuel. My car doesn't really smooth out till I'm at about 13.6 - 13.9 AFR.
Your AFR really will change alittle with the temp outside, unless your fuel management can comensate with a air temp sensor.

Also check your BOV to see if it leaks at all, try adjusting it alittle tighter or looser perhaps.
 
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