Thanks for the reply.

When I pulled the No. 5 Glow Plug, I noticed that it was resistant to simply being slid out because it was somewhat "siezed" by the carbon buildup around it, which brings up two questions:

1. Is it possible that the carbon buildup could be producing the "slightly" higher resistance readings (Instead of less than 1 Ohm, I'm getting approximately 2 Ohms, NOT 50 Ohms, or open, or short!

2. Is it a foregone assumption that the precombustion chamber the Glow Plugs fit into needs to be reamed out before installing the new Glow Plugs? Is this reaming a fairly common procedure (meaning: most people do it) when installing new Glow Plugs?