Drove my escort home from work gave it a bit of stick in third and started missing and throwing out black smoke of exhaust. But then when u come back on boost clears untill i come off throttle and on again.When i rev it in neutrul misses all the time no white smoke just black. Seems to be electrical cap and rotor are nealy new have a spark on all cylinders.Has anyone had this problem i suspect plugs took them out and gaps seem fine and they look ok ANY HELP APPRECIATED THANKS