ok so i was driving on the hwy at night an i noticed a small spark go up the windshield out from under the hood. i had been seeing it out of the corner of my eye for a while but finaly realized what the heck it was. does anyone have any idea of what that could be. the only thing i can come up with would be that my exhaust mani has a crack or hole in it. please help im worried it's gonna mess something up.