1995 GMC Sierra Higher than normal idle when engine is cold

For the last few weeks my engine runs at a higher than normal idle speed when it's cold. It normally runs at 1000 rpm when warming up; however, lately it runs between 1300 to 1500 rpm. The SES light hasn't come on and fuel consumption is normal. The idle speed does reduce as the engine warms up, which it's supposed to do. I'm wondering if my maf valve or egr valve are possibly defective.