My wifes aunt just sold me her beater 09 cobalt for 100 bucks. 250,000+ miles, check engine light on, Misfiring on 2 cylinders, and her son has been driving it fairly regularly with the dummy light on for a while. I figured as long as it gets me around for a few months till I can stack a bit of cash for something better why not? I figure I'll run a compression/leak down test, check the plugs/coils, and check the fuel injectors etc. anything else I might wanna look into on it? the AC is blowing cold, i don't see any coolant in the oil, not burning oil, needs new brake rotors and oil change, Just wondering what some common issues are that I should probably look into.