Having a stalling issue

[Mark8117]

Running a 400 BB with aftermarket intake and headers.  727 3spd
Running a 750 Holley DP and an Holley fuel pump.  Electronic ignition

After the car warms up 10 min, it will stall when shifting into gear.  Why?

I have adjusted idle/ timing.  The fuel pump is new as I thought that was the issue.  Carb was just rebuilt and still same issue.   

Any suggestions?

[72cudamaan]

What's the timing set at and the idle as well. First thought is vacuum leak.

[Chryco Psycho]

What is the manifold vacuum both at idle & in gear , could be a powervalve or the idle transfer slot uncovered too much requiring opening the secondary idle a little or even holes in the throttle plates or it could be a timing issue or a problem with the dist advance so it retard as the speeds slow when put into gear

[Strawdawg]

Assume it did not do this originally?

Did you make any changes recently?

Steve

[cudabob496]

On a DP, having the four corner idle system set up properly helps a lot.

[Mark8117]

Thank you for the input we will check for vacuum leaks and work our way through the list