I have the same problem on my 90 LX. Car sometimes starts and stalls almost immediately. Attempts to restart are useless. The car has to sit for a few hours before you can try again. Lost count of how many times I've killed the battery cranking the engine (my battery charger gets a regular workout). Now that you mentioned it, it only seems to happen when it's warm outside, usually late afternoon.

First guess was bad gas as it didn't happen often. Many bottles of drygas later it still has the problem. Second guess was tuneup. New plugs/filters/cleaned out intake/oil change didn't fix it. My next step was cap/rotor/wires thinking moisture in the ignition parts. Now I think I'll pick up a relay and try that first.

Thanks for posting your problem.