Here's what I'm thinking; the problem didn't start until I swapped air cleaners, so I must have bumped something in the process. The only 3 external things I can think of that would affect fuel metering are;

1. The metering rod tree. Which seems to be moving freely, but I will watch it with the engine running to make sure it pulls down.

2. Divorced choke. I can take measurements to make sure it is still adjusted properly.

3. Choke pull off. I'll hook a vacuum pump to it and make sure it's still working.

Anything else I should check?