has spark and fuel, wont start.

Pull a couple plugs and see what they look like, having fire and gas sounds like your plugs are not doing there job, Where are you checking the spark at ?
If they are gas fouled from a cold start they will not ignite your fuel.
Yes I have been here before and the spark was there but no detonation, and a coil has a mind of it's own when it wants to get week. what color spark are you seeing ?