I haven't made any big changes to my truck in several weeks. I am running Nicktane Filter, Banks Exhaust, and AFE state 2 intake. Last night was cold so I plugged it in. This morning I started it up and let warm up for 15 minutes. I got in my truck to head for work and my check engine light is on. My truck is running great....I drove it 10 miles to work....drove it home for lunch..etc. All the guages are fine and everything SEEMS ok. Any ideas what I can check??