Just did a heads, and cam install and now that I have everything back together the car is just turning over but not running. I have tested for fire and it looks like I am getting fire, but it looks to be real weak but I don't know the difference in strong and weak spark. Could it be a timing issue? Its not backfiring or anything just turning over and every once in awhile I will get something out of the throttle bottle kinda like a backfire but no real big noise.