i have a cobalt ss 2007 supercharger LSJ 2.0L .... the car start and die automaticaly when i try 20 time to start the car now i stay started but the rpm idle rev jump to 500 to 3000 black smoke im not able to drive the car ..even in the yard.. and the only code i have is P0300 random missfire of course spark plug is good coil is good gaz pump is good any idee ?? what can cause that ??

 

please do not double post the same thing