Not sure whats going on here but I started up my car this morning and it ran fine. Drove it less than 1/2 mile, where it sat for 2 1/2 hours. When I attempted to start it again it was running very rough and when I tried to give it a little gas it would jump up to about 3,000 rpms then die. If I let it idle it would eventually die but took longer. I tried turning on electrical and let it stay on before starting engine but that didn't help. Temps here are single digits. Any thoughts?