Fuel pressure should be checked with a gauge and should be above 41 ps1 at key on prime. Pushing valve is not a reliable way of determining fuel pressure as it can squirt out at considerably lower pressures than engine needs to run.
Another thing to check would be your electrical part of the ignition switch. It's located under the dash, attached to steering column. Look for burnt connector pins, bad connections, etc. Also get wiring diagrams for your 94, and check for proper voltages on all outputs of ignition switch when problem occurs.
Don't have 94 wiring diagrams, you say. Then go to 4th gen section, look for thread titled "GM service manuals" open thread, click link and download factory 94 service manual. Volume 2 has wiring diagrams, component location diagrams, driveability, emissions sections. It even has a handy pcm connector symptoms chart that tells what happens with each pcm wire if it's not right.
Which brings us to checking pcm connections, power wires, grounds, engine grounds, etc, in your search for the offending object.
And don't forget to remember, just because you puta new part on the car, you can't eliminate the new part as a suspect. Test them all. Sticky threads of this section has diagnosing the opti video, with tests to run.
www.shbox.com also has opti tests and coil tests, as well as, factory manual you should download.
Note, the fuse that supplies the coil and icm, also supplies the automatic transmission with power. So a problem with the wiring, connector, pins, electrical components of the trans could draw down the power going to coil & icm and cause a no run situation.
Final note, arm yourself with knowledge, testing and troubleshooting techniques, and you will find your problem or problems using a systematic approach that leaves no stone unturned.
