Lots of good suggestions for things to try. Hopefully we will get it nailed down.

The overall curves on the dyno looked OK (i.e. didn't fall flat above 4K for example) but the entire curve was a squiggly line. It was very strange. Random misfires and such usually result in spiky lines.

All of the spark plugs looked exactly the same when we pulled them out. There was nothing to point to a single cylinder having an issue. We will keep working that idea, though.

Thanks for all the help. I'll let you know what we find...


Richard P.