Cpollock

My truck wont start. It will turn over no problem, but it won't start. Only fire a few times when I start to turn it over. But it won't start. Theres spark, fuel and compression. SO would the computer be getting false readings of when to fire the injectors and spark plugs? Also the check engine light is on but when I plug my code reader in to do a check it says no codes. So will I probably need a new ECU? I'm pulling the injectors out to see if there dumping too much fuel in at a time which would cause it to flood out.