[01mmmz28]

there is a small hole on the throttle body blade that allows air to come in at idle. Make sure this small hole is not clogged up or blocked in any way. If it is only during the cold, moisture may be getting in there somehow and causing the maf to read poorly upon cold start up. clean the maf and the throttle body and see is that helps. If not, try the fuel filter, mine acted up during the cold before, because it was dirty and needed replacing.