my brother recently bought a 1984 gt with a 5 speed, once in a while it will idle funny it sounds like it is not running on all cylinders and will idle really low like 200-300 rpm, and if you shut it off for a while and start it back up it will run fine so it kind of sounds like it is something electrical, it also has a brand new edelbrock carb and intake manifold, and it did it with the origional carb and intake manifold so it has nothing to do with that.So does anyone know what this problem can be??