Typical problem when the vacuum power piston is either stuck, its spring is missimg or not recieving vacuum due to port between carb. base and intake manifold restricted by gasket or improper insulator under cabuetor.
To make a long story short power piston is stuck in the rich position.
First thing I would do is remove the carb. and see if the litle hole on the bottom of the card. base is covered up.
The correct insulator block under the carb. has four notches, one of them must line up with the hole under the base. f you have a gasket in this area remove it, it is NOT necessary.
Last edited by Chev Nut; 01/19/23 07:57 PM.