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It looks like I've fixed my problem. As it turned out, sometimes the fuel pump wasn't working. Sometimes the ignition wasn't firing. The key was the check engine light wasn't coming on when it wouldn't start. I found a thread on another forum (jeepforum) that hit the nail on the head. My PCM...

I have a 1995 Jeep Wrangler YJ with MPFI. The problem is it will instantly die on the road, no missing or sputtering, then won't start. Cranks fine. Does start when it is good and ready. I thought it was happening when it had been running and was really warm. It would start after maybe 30...