No Start getting fuel and spark

I cannot seem to get my truck to start. I am getting fuel and spark. I replaced my entire distributor, coil test better than a new one in the store and new plugs/wires. It cranks but does not seem to start. Last time it ran, I parked it to hook up a trailer and it has never started again. I cannot read the codes since they are just the lights and I inadvertently cleared them without writing down the number of blinks.