My sympathies on your problem! I would have sworn, from everything I've read here and on the Easley list, it was the throttle actuator --
I like the above suggestion re: cleaning all connectors. The other thing I'd try is to replace all the fuses. Folks on the "other" list say to replace all fuses at 10-year intervals, and yours is officially 10 years old. Sometimes fuses look just fine but have little cracks and cause weird intermittant problems which defy diagnosis.
At any rate, it's a cheap thing to do.
Good luck to you!