[hexskrew]

I am having this EXACT same issue. Let me ask you, did you mess with the wire running to the rubber grommet in the drivers side of the trunk kickpanel? If so then that has GOT to be the culpret.

Here is what happened with me:
Car has been sitting for a year (busted water jacket on intake manifold, patched but don't know how reliable it is)

Started frequently to ensure it keeps running :X

Last week I got some stuff to do an oil change/tuneup. Jumped it off and it cranked right up!
Changed the oil...
Engine turns over, but does not start. Gas gauge does not move.
Checked all fuses and swapped the relays/tested the relays as well.

Took the top off of the fuel pump relay and pressed on the connector (lever), and you can instantly hear the pump run. Tried starting car while holding relay to on position (and can hear the fuel pump running).. Still wont start... so I checked for spark.. There is NONE. Battery is absolutely fine (swapping it when working on it out of my 95 cavalier)

It ran fine before doing an oil change, and the only thing I touched not related to the oil change between the VERY brief time where it would and then not start, was in the trunk I was cleaning the car out and noticed it was holding water in the little compartment on the drivers side of the trunk, which has a rubber grommet with wires going through it. I pulled the grommet to let the water drain, and now I am where we are at now..

Tomorrow (well today) my main goal is to check that harness and see if there is corrosion/broken wires where that grommet was (and where the standing water was above the grommet).

I have read that this wire DOES go to both the fuel pump and sending unit, and could be a possible broken wire. However I have no idea why the hell it would cause the ignition not to spark??

Hope this helps you! (and me as well.. I have checked everything else..)