The blades are returning to the stops. I also put on a new throttle plate with no change. I also force them back to the stops and it doesn't change the idle any. I put heavy springs on the distributor and checked with a timing light so the timing doesn't' start to increase until past 2k rpm and I've watched the timing while it is at high idle and it is not moving off of base idle setting. The idle screws seem to work but I will try blowing them out.