Still feels like it will stall...

[Lee81]

Ok, well I haven't been able to really get this thing to a mechanic nor have I been able to really look at it myself. Basically what I've noticed is that there is a very gaseous smell emitting from the exhaust with black smoke. There are layers upon layers of soot, or black stuff on the ground from my exhaust. What on earth can it be? I also fill up on gas on Monday, have to refill on Wednesday and then again on Friday, just from going to college and work afterwards and I've always only had to fill up once a week, not 3 times in a week. What could cause the gas smell and the black soot?