Can't start a 1988 Ford E250 5.8 will not start. So far we replaced the coil, MAP sensor, Ignition control module. It went from very weak yellow spark to very strong blue spark. Has adequate fuel pressure at fuel rail. Tested an injector for fire with light tester and found pulse while cranking. Cranks but not starting. Removed air intake and sprayed starter fluid... only barely sputters. What are we missing? What else can we check?
Before it decided not to start at all it would die at stop signs. Installed new distributor cap, rotor, fuel pump, fuel tank, plugs & plug wires while trying to solve this annoying problem.
Please offer any insight you have to this issue...