i have a 1995 mazda millenia 2.5L my car will not start, and can't figure out why. then while checking some things out i noticed something wierd. when i try to crank it over it won't start, although, when i take the sparkplug out immediately after, smoke pours out from the spark plug holes. my sparkplugs are also covered in black carbon. it seems like my exaust is putting out enough though. i have no clue what this problem could be. do any of you have any suggestions or ideas what this could be?