Hello RKreutzer,

Thanks much for your reply to my query. Indeed I should have done more archive searching prior to posting my query. In the past couple of days, I have been searching and I have found several items which could be causing my problem. I've already eliminated two of them from consideration and two other are currently on the table for examination. Of special interest right now is the possibility that I have an exhause value in need of adjustment via way of shimming.

Again, thank you.

Bigcar