Hi,

when starting my Vectra with cold engine when i get into neutral it goes up to 2000 rpm.
After 10minutes driving it's back to normal 800rpm idle.

There are several pending diagnostic codes:
P0100 - Mass Air Flow Circuit
P0170 - Fuel Trim
P0110 - Intake Air Temp Sensor Circuit

Do you have any ideas what coud be the problem?
Will replacing MAF help? (it looks like the air temp sensor is incorporated in the MAF)

Thank You