[Roger Bray]

I'll tell you what I did, but it would be wise to verify my technique with some of the more experienced people here on Clubcobra.
I removed one plug and let it lie on the intake manifold so the plug would be grounded. I tested the manifold with my volt meter and it was grounded.
The other plugs were left intact. I also took a video of the plug while I was doing the test so I could get feedback from other members.

It took me several days to track down my problem.... frustrating at times, but it was a great learning experience.