I realize this post is almost two years old but I was just curious if you found the correct wires in the harness connector that supplied power and ground for the ecm. I have the same problem on a 2009 Journey 3.5l V6 fwd. Same connector same issue. Wiggle the connector and it starts. I tried to open the ecm but didn't because of the gooy insulation. I too wanted to check for cracked solder joints. Hope you fixed your problem.