2011 2.5 rough idle when cold

[garyk]

I've taken my 2011 legacy to the local dealer, and two other repair shops that specialize in subaru repair for rough idle when the air temperature is less than 60 degrees fahrenheit. So far I've cleaned the throttle body, replaced the pcv valve, replaced the egr valve, replaced both the up stream and down stream O2 sensors, replaced the Mass air flow sensor, removed and cleaned the fuel injectors. When I first start driviing, at every stop I have to feather the gas pedal to make it run smooth. If I take it out for a run on the high way it performs excellent, has plenty of power and good fuel economy. After that it idles smooth as silk until it cools of and then it starts all over again. I've worked on cars all my life, but this one has me stumped. Any advice would be greatly appreciated.