We have a 1992 GMC safari that won't start. We have replaced the fuel pump, spark plugs, battery, ignition module, cap rotor, coil, and checked compression (which is fine). It is getting fuel and spark. Still won't start. It is a TBI motor with Z in the vin. Any ideas? It acts like it wants to start, but won't. Have changed the order of the wires on the distrutor cap in every combination and still nothing.