65 c20 wont idle down sometimes

[Mtxrocket455]

First time posting here. I've had this truck for about a year and its ran pretty good. All of the sudden in the morning the idle won't return to its normal idle. I stop at the gym on my way to work, about an hour and half later I start it back up and it's fine (usually). After work it is fine too. I live in Sacramento where it's a little cool in the mornin and blazing hot most days.
It's a 65 c20 with a 350 from 1973, and a 4 speed granny gear. It's a points distributor, carter afb w/electric choke, edelbrock performer intake. Cam seems to be near stock.
Timing is good, it hasn't moved from where it's been. I've pulled off and stuck back on all vacuum hoses with no changes, I've even changed the vacuum hoses; there are only a couple. I've sprayed a little water all around the carb with no change in idle. I've thoroughly cleaned all the linkages on the throttle as well as the choke. It does it with or without an air cleaner on, and it's a new air cleaner.
I'm running out of ideas. Is my choke just bad? I didn't want to replace it and the problem persist. Any idea is appreciated. It's unfortunate that I can only test it once per day. I have a small window in the morning to work with.
Posted via Mobile Device