[KobraKarl]

Mike ,

It could be a couple of things, but if its"just out of the box" you probably need to adjust your idle mixture screws.

back your linkage idle screw off until the primary throttle blade is just opening

Turn the idle fuel mixture screws (on each side of your primary float bowl) all the way in GENTLY ! then back them out one complete turn, then back them out 1/4 turn at a time untill your engine does not pick up any more rpm. or if you have a vaccuum gauge until you have maximum vac.

then set your linkage idle

this should get you close, also check your timing ,

KK