Thank you guys, for the response's!
I had code P0676, #6 glow plug circuit problem. I installed 4 new drivers side glow plugs, new harness(in the valve cover) and a new valve cover gasket. Cleared the codes, and the "Service engine soon" light stayed on, after 3 start/drive cycles. I have not yet, driven it to Santa Rosa "Pep Boy's" to re-scan for codes. I thought I did the WRONG side, but i guess not.
It starts and runs OK, but I want to correct this problem. All help appriciated!