After reading many posts and trying to find out why my '83 Z28 with 4bbl qq jet runs so bad when the engine is cold... I saw one of Sonix's threads saying it was probably the choke... so I adjusted the leaf spring screw in a few turns and YES!! Started right up and didn't die like usual! All good, right?

Well, she seemed to run ok, but was idling around 1500-2000, and would not "kick down" too easily, but eventually did, at which time idle went to 500-750 and was rough.

So like an idiot, I fooled around with the screw again, turning it out 2 turns.Then it started, and idle kicked down quickly, to 500 rpm... ran real rough though, and died. After further "screwing" with the screw, now won't start at all! Crap! I will try again tomorrow night when I have a fresh {cold} start. Any pointers or advice?

BTW, thanks Sonix, your posts on choke stuff helped a lot! I may figure this out yet!

I believe I also have to set the dwell and timing- I will do those next...

 

UPDATE_

So I tweaked it. starts immediately, and idles at around 2500-3000.

After about 3 mins., check engine light comes on. I gotta figure that one out...

A few minutes later, I hit the throttle and it kicked down.. to around 750-1000, and runs rough.

Upon restart, it starts right up but idles low and rough...