To begin my car has been running rough for about a week. It was hesitating on staying running when I would come to a stop or going at a slow pace. It needed oil and I had added too much by about a half to one quart. I also had added SEA FOAM to the fuel tank after filling up. Today wheile I was driving down the road at about 35 to 45 my car was hesitating on running, choked and spat out a big blue cloud and the immediately following it proceeded to pour out a blue thick cloud of smoke mixed with a smaller amount of black smoke and was trying to die at that point but was still running when I had shut the car off. Any help would be appreciated! Thank you!