[Gaz64]

Originally Posted by snowgoer

I have a brand new Ford Racing 392 with a Holley SA (I think 750) with vacuum secondary. Since I got it 35 miles ago it has had a stumble when you accelerate. Yesterday it would not start so I took off the air clearner. I noticed the choke was open about 1/4 inch, engine was cold, and it would not close all the way, even after pulling on throttle. I moved the electric choke a little to the left, which should close it more, and now it snaps closed when yopu tap the throttle. The question I have is as it cools down the choke still only closes to 1/4 short of completely closed. I hit the throttle once and it snaps closed now. It seems the the red fast idle arm may be keeping it from closing all the way. Is this correct?

Good news is when I moved the electric choke to the left (Counterclockwise) the stumble is completely gone. I can't wait to drive it like this now as it seems to really accelerate quickly.

That's correct, all automatic chokes run a stepped cam for fast idle speed.