Thread: 3X2 Carburetor idles too rich/406 engine

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check the trottle shafts. they could be worn. causing the idle to be reatic. i've run into this problem with holleys in the pass. pony carb. can fix them.

There's no reason that it can't be fixed to idle correctly. After all the primary is just a two barrel carb.

The others have good suggestions, but here's one that we used to find common "back in the day" when I did tune-up work at a Ford Dealership. The body on Holley carbs (both two and four barrel) warps/distorts because of "over tightening" of the float bowl screws. It can be checked with a straight edge and if found warped, you can use a flat body file to true it up.