Well, welcome back Steve! I think it's also unusual that no tech other than you has weighed in on this rpoblem. Going through the entire thread I noted that respondees are all forum veterans but none "MB Certified" (at least to my knowledge). Similarly, a recent harness & MAF suspect had the same treatment.
I just thought to comment on this aspect of it, not to question the responses from everyone else, whom BTW I all respect. Maybe everyone's real busy right now?