It will crank but wont start i have spark to spark plugs and replaced

What is your question?

I replaced almost everthing under the hood i checked the fuleinjecters with a 9 volt battery and some brake cleaner in every time i met + with wire it sprayed. I hear fule pump coming on so i think its ok when i took spark plugs out they were black and wet this van also had cat over heated do u think maybe somthing wrong with heads