So i have a 1980 pickup, it has been sitting 20 years have cleaned gas tank, rebuilt the carb, fixed air conditoning twice and did a tune up got new tires and have enjoyed driveing this truck daily, but i seem to be messing with the carb too often, if i spray carb cleaner at the throttle shaft it idles up(still idles when you shut off the air/fuel by turning screw all the way in). I believe the bushings must be worn out, i really dont want to get a webber because my truck is all original and idles up when you turn on the a/c how will that work with a webber. Do i have any other options any help would be appreciated. I would post pictures if i could figure out how to do so from my phone