onebadgmc,
thanks for the help, the vacum port that is being used for the dist. is the left one if you have the hood up and are looking straaight at the engine.this is not a new carb,it has been on the engine for a couple of years,i havent been into the carb yet to check for dirt or to check the gasket, there is no moisture inside the dist. as far as i know the motor hasnt been washed within the last couple of years, but anything is possible, i will check out the diaphram with a vacum pump and see what happens, i havent really had the time to tear into it and check it out,so i just wanted to get some opinions and see if anyone has ran into this problem yet, so thanks to everyone for the help