about a week ago i got my carb tuned by a guy who said, "i dont know much but ill do what i can". I thought he did pretty good. it ran really nice. when i got home i decided to check all fluids. I thought that it could use a bit more oil so i gave it a quart. Then i went about 75 miles away from home and turned around. when i got off of the exit it was shakeing the whole car. i figured it would be gone tomorrow. so the next morning i go out and it is still there shakeing hard. Do you think i added too much oil? So the next day i drained out a quart of oil. i should probably check my plugs right? so every day now it gets worse. It pufs out black smoke, and doesnt accellerate like any mustang should. It is hesitant like when it is accelerating. It is only getting worse too. this ever happen to anyone?