Just an update...Just took the bike out to eliminate the seat post/saddle. I did as advised and stood while pedaling and the noise was still there, changed left pedal and the problem was still there. Pedaling with only the right foot, sound was not present. As I rode this time, it sounded though as if the rattle was coming more from the front wheel. Again only while pedaling on the left and under pressure up a hill. Will continue to eliminate and update for those interested.