Hey just a follow up- the electrical mystery was finally discovered to be one shorted wire. First mech plugged the ECU in in 1,2,3...2nd mechanic did 1 and 3 and narrowed issue to wires from 2nd group- so 12 wires. Ended up the wire for exhaust, fuel sensor. (If I understood it correctly).
My goodness, a fresh pair of eyes can make a big difference.