Holley jet ?

Don't put your foot into it on a cold engine, it's hard on the piston skirts. Yep, it'll run crappy without a choke when it's cold. Either wait until the engine hits about 160 before you drive or put the choke back on. Pulling the choke plate out may give you a few extra cfm, but it's really not worth it on a daily street driver.

You can richen it it up so it runs better cold, but then it'll run overly rich once it warms up.