Thanks for the great suggestions folks!

I think I will check the injection pump timing this weekend as well as do a compression test. Will post the results once I get them.

I have a new relief valve spring so thats definitely good.

Unless something drastic is revealed through those tests, I think I will leave things alone and just live with it.

Too many times have I gone after some small issue that was bothering me on this car and ended up with massive hits to my finances.

BTW, the lopey idle really started after I had the injectors rebuilt. While they definitely increased power and smoothed many things, it probably unveiled some other issue that needed attention but was hidden by the worn out injector nozzles and sluggish performance.

Will keep everyone posted.

Thanks