So I have a holley DP 750 race demon carb and it holds the idle high when driving and coming to a stop - this is a manual trans car - pop the clutch in when the motor is 1500rpm or so and it idles high - about 1350-1400. When you first start the car it idles at the set point which is 1100. It's a big cam. small block 406. I just changed the disty to a MSD with vacuum advance so I wonder if it's pulling in more timing at high vacuum levels at 1500-2000 on decel and then it holds it there. I could try blocking that to see if it changes. but assuming it's not related to timing - what would be causing the throttle to hang up on this carb? Car has a lokar style cable linkage - I haven't really checked that out too much either. Has a return spring. Doesn't seem to happen when I start the car and test it when stationary so I can see the throttle. Maybe it's just sticking a bit? Ideas?