I started my car this evening and it is running real rough and using a ton of gas. I made it to work okay, but need to drive to a garage in the morning. The temps here are around 2 degrees. What could cause this? The care ran fine this morning. What could cause the sudden missing and gas usage and loss of power?

If check engine light is blinking I would not advise driving car. Serious damage may occur.

Found out the issue. The spark plugs were bad causing the coil to overwork which in turn messed up the ignition module. Had to replace the plugs, plug boot, coil and module.

Vacuum leak.

Check by putting smoke in system. It will exit where leak is. Put in intake through intake hole where pcv hose connects to plenum you will see smoke exits.