Need some help with my 4100.I can not get it idle lower then 1000 rpms,at this time the idle speed screw is not even in contact with the throtle shaft and the fast idle screwis also turned all the way out and it still will not go below about 1000 rpms.The carb must be pulling fuel from some where.The sec.butterflys are set to factory specs3/4 off closed.Why is this thing still running with the idle speed screw all the way out, it runs great,no bog off idle.i just rebuilt the carb with the motorcraft kit,just like i've done dozen of times before.
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