I have the same problem on a 93 Lumina APV 3.1L. No spark and NO gas at the injectors. Checked the pickup coil and coil and checked all connections at the distributor. Here's the thing - it worked fine for quite a while then back to the old behaviour; won't start if warm but will start up fine a couple of hours later, sometimes stalls at idle (usually at a busy intersection). Let me know if the computer swap turns out OK! I'm gonna take out the distributor and clean everthing up and try again
