When I bought my truck, it idled great, hot and cold. I didnt have problems with it idling when hot until I put new injectors in it. I also had some injection pump problems, at least I did until I bought my baby moose.
I was told by a local shop that I had a weak lifter, so when my head gasket blew, I replaced lifters and rockers, still the same issue.
Hammerdown had the same problem after changing out his original parts, although I think his was pump related but it sounds like he still has days where his idles a little rough also.
I guess I should see what Russ would charge to rebuild my original Stanadyne injectors.