Trouble running when first starting

Oh, too late. :-)
I was going to tell you that the choke deal can be easily verified by taking the air cleaner off and start the car.
While it's running open the choke a little by hand, and if it smoothes out that is the problem.
It works the other way too (sometimes they need more choke to stay running nicely)
You can dial that puppy in to perfection this way (by seeing what it wants)

Which reminds me, that now that it's a getting warmer I need to back my choke off a little.
If I start it and walk away without tapping the gas pedal it starts to sound a bit like it has a lopey cam in it. :-)
(Over choking a little bit)
Mine is electric and adjustable though. and doesn't use a pulloff like yours.