Sounds like trapped air to me. Your water pump is not pushing a hella lot at idle. We need yeah to go blast that thing down the road get some rpms up. While it’s warming up to temp. Then shut her down let cool and check coolant level.
Thanks hopefully next week I can get the driveshaft done. Im almost considering paying someone and having it done. I hate doing that. But im working 72-84 hours a week now I just don't have the time lol.