Engine light came on, then after shut off wouldn't start until after an hour or two

I have a 1994 S-10 new body style pickup with V6 4.3L vortec.

Same problem when got home. Now, it starts fine?

I was driving to the bank and pickup ran fine. Half way there, the engine light comes on but I notice no other issues. Still ran great. Got to the bank, was going to leave it run but I shut it off instead to save fuel. It would crank all I wanted but not fire and you could smell plenty of gas. After about 15 minutes I tried some more, it fired for about 15 seconds but died. Had friend come down to pick me up and after hour and a half we went back and it fired up. I decided to get home before something happened. Engine light came back on after about 30 seconds, but it still ran and I got it home. Shut key off, and after that would not start.

I have not done anything to the pickup at all except check wiring and make sure there was nothing loose or unplugged. But, after it has been at home, it keeps running no matter how hard I drive it and it keeps starting. I cannot recreate the problem so I do not know if it fixed itself or what the problem was.

The distributor was replaced about 30,000 miles ago, so was the alternator, ignition control module, ignition coil, battery, yeah, everything went to hell at the same time a couple years ago.

But this problem has me not trusting my truck to take it anywhere. Where should I focus my search? What is capable of causing an intermittent no-fire situation? I am suspicious of the security system though, and with help of the locksmith I will have it removed completely.

Also, my trouble codes will not flash manually nor with a code reader of any kind, brand or what not. Is there some part of the diagnostic circuit that could have went out that I should check/fix? I would very much like to see what the computer has to say.