Hey guys, I just bought a new Edelbrock pumper carb. Installation was nice and simple. I am however having some problems tuning the thing. I am having problems with the idle taking along time to fall off from open throttle positions. It seems to have a little spuder if I hold the throttle about 1/4 of the way open. The spark plug is nice and tan so I don't know what to do. Any ideas of what I could try?