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Check each and all grounds you can find. really dig into it.
Look for any rubs, chews, cuts, corrosion on any and all wiring.
if none of these things are found, or if found and repaired, and the car still does the same, I suspect you may have a bad PCM. If the scantool won't communicate with the PCM, and all the wiring and connectors are good, it almost has to be a PCM issue. Especially if intermittent like you are talking about.
You COULD pull the pcm, take it apart(if possible?) and look for a crappy solder or several of them. I've repaired several different PCMs and other modules by fixing bad solders.
Of course this and every other post on here is conjecture and (educated?) guesses as we don't have the car to look at.
PS, I am a Red Seal automotive tech, so I am payed to fix crap like this. Don't guess, and follow a logical course of action.
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