I,ve got a 02 3100 Malibu, blower , intercooler headers ported heads and a few other odds and ends, my problem, I can drive a few miles , stop a couple minutes, it will start right up, as soon as I put it in gear and try to move it will stall, I got to really crank it a lot to get it to start , because it is loaded with raw gas, black smoke out the tail pipe, can smell raw gas, and it will miss really bad until it gets cleaned out, it will then run normal for up to a week before it happens again can someone give me a idea what causes that problem. thanks