2008 equinox runs lean while idling

My equinox has been running lean during idle anytime I'm stopped at a light or start the car. New throttle body have done the relearn it just still runs lean. One shop seems to think maybe a leak in the intake. I'm replacing the MAP sensor since it looks loose and old. Any other ideas on to what could be happening. Car runs great once it's not idling speed not an issue MPG is good never loses power when in drive just while idling under 1k rpms and fluctuating to high close to 2k or low enough where it stalls. Again I've now been driving about 3000 miles already and cant figure it out. Car sat for a year so I did full wire and spark plug change.