Alright, I never had this problem before. My car is a 92 GT with a 306, Edlebrock aluminum heads, Camzilla cam and everything that goes with it. Recently after warming up and driving for a few miles when I go to downshift coming to a stop ( vaccum sucks from big cam affecting power brakes) it will cut out. The car will start back up by the key or popping the clutch but somthing is wrong. It starts fine all the time I just don't know where to look. It seems like when the clutch goes in coming from 3rd to second is when I notice it. Any ideas or direction I should be heading? Thanks.