I have a 1992 Pontiac Sunbird with a 3.1, automatic. I have replaced the motor, timing chain, trans pan and gasket, drained all gas and refilled with new gas, new plugs and wires, new coil packs, base coil pack mount, new fuel filter, and sensors, new fuel injectors. It has great compression, spark, and great fuel pressure.
I can shoot starting fluid directly into the fuel intake and it will run as long as it is receiving the starting fluid, but it will not run on its own. I have also gotten the car to semi-start for only a second. Then it could take as long as an hour to make it do it again.