'66 122s w/B20, Weber DGV (manual choke). I spent a lot of time last year getting the Weber tuned up (WB A/F meter sure helped), and all has been well for the past 8K, but at the end of a 5 hour, mostly highway drive last week it wouldn't idle properly- indication is that it goes too lean and stalls. Starts from cold with the choke pulled, but then once warmed up and I push the choke in it leans out and stalls. Checked the float, pulled and cleaned the idle mixture screw and jet (and tried a larger jet), but no difference. Funny thing is, I put in a much larger idle jet and it was OK for a few miles, if a little rich, but then it went back to stalling at idle. I can keep it going by pulling the choke when I need to idle (or keeping on the throttle), then pushing it in after getting moving, but that sure is a PITA! Other than at idle, everything works/sounds/feels fine. I'd expect it to be running lean at speed without the idle circuit working properly, but the A/F meter indicates things seem way they usual are when I'm on the throttle. Any ideas? Seems like maybe some grit stuck somewhere, but I've blown carb cleaner though all the orifices I could find, etc. and it didn't do anything.
Thanks
Tom
NY