Truck will not start

Check the throttle position sensor. If the computer thinks the throttle is wide open, in this case because of a faulty throttle position sensor, it will go into clear flood mode. In clear flood mode the fuel injectors will spray very little. Also check the coolant temperature sensor and, if equipped, the crankshaft position sensor. A bad coolant temperature sensor can cause a no start condition on an OBD I GM as can a bad crankshaft position sensor because the computer doesn't know that the engine is cranking so the computer won't pulse the fuel injectors. Is the service engine soon light or check engine light on? If so, can you pull the two digit trouble codes from the computer? Hope that helps! Jim