Hi. I have a 05 cobalt. Out of no where, the car starts to shake, I thought it was ready to stall. Check engin light comes on...it will alternate from blinking, to steady on. I get a reading of P0301. Cylinder 1 misfire. I was told by multiple people to try changing the spark plug, so I tried that and it did nothing. Still runs rough while idle. Someone suggested trying to Rev over 4000 might clear it, so I gave it a shot and it just dies. I am not very mechanically inclined, so I am not sure what else to do. Any help would be greatly appreciated. Thank you.