Report "92 Roadmaster 5.7 liter. Replaced distributor cap, rotor and eletronic control unit, plugs and wires, coil, fuel pump and line filter. There is spark at the plugs but the engine will not fire. Disconnected catalytic converter still won't start. Fuel injectors seem to be spraying adequate amount of fuel into carb. Crank engine for a 30 - 40 seconds and it won't fire"