All good suggestions- I would add this: make SURE your choke is opening fully as the engine warms up- if it's not, that would explain why it's loading up at low RPMs and clears up after opening the throttle up for a bit (the throttle linkage will manually open the choke as more throttle is applied).
Always check the simplest things first.
No choke. I am leaning towards dirt in the needle valve. I think I found a contact who is very good with Thermoquads in my area. If this is confirmed, I will have it rebuilt so I am not screwing around with it.
