CHECK THE PCM DIODE. Apparently these get loose over time.... I had the same symptoms, car would randomly not start. Drove me crazy for months. Then one day I was pulling the relays in and out and noticed the PCM Diode suddenly made a CLICK when I pushed it down. Apparently it was creeping out of it's socket over the years. All I had to do was push it back in, and voila! problem went away!!
Btw, in my car, Lincoln Continental 1999, the diode is to the left of Relay 7 (PCM Relay). This solved the mysterious "GEAR DISPLAY ERROR", CHECK TRACTION CONTROL, etc., and PATS code 16.
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