Ok, so I just installed a new edelbrock AVS 650 cfm carb on the 383 magnum in my 70' Chrysler....she runs great....plenty of torque, it's all good...BUT (and this is the annoying part) at looooong red lights the idle will become somewhat choppy as if a cylinder is dead...then step on the gas....the RPMs come back up and its smooth as ice. Trying to whittle down the list of possible causes here, any ideas?

 

FK -

Anything.

Is the A/F mixture correct?
Could the fuel filter be clogged? (not likely if you're good at higher RPMs)
Could you have a vacuum leak (anywhere). (My money is on this one.)
Is the curb idle high enough?
Could there a problem with the idle circuit (within the carb).

Archer

 

Did you set the floats? One of them could be too high and drowning out the car at idle.

 

I have it tuned a little on the lean side...don't want it running rich, made multiple test runs right after setting up the carb.....I get dynamite throttle response from idle all the way up to factory red line.
Vacuum leak, hmmm...guess I'll look for the obvious first...maybe that's it.

 

Never had that problem with a new carb (edelbrock) but I think I'll check that out too....guess its never done until its done. Thanks!