Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

new to forum. have issues with rebuild on new motor

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Frank400:
  Your carb definitely has very fine metric threads (they started in '79).  With those, when enlarging the idle discharge, I have had to shorten the spring quite a few times for the screws to seat. 

   I'm guessing that at .103, you shoul get by just by cutting a coil from the idle mixture screw.
   
    Frank.

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