[ed cougar]

Hello, and thanks to all who respond, my 428 SCJ has this pusating idle, the air adustments on the 735cfm are responsive when I turn them in the idle roughens then back a little an it smooths right out but still has that pulsating, the timing mark also hunts a little with the pulse, what would be the most probable cause- valve adjustment-worn distributer shaft? Could the manifold be leaking vac. and whats the best way to check, it pulls about 14Hg at idle and it also hunts a little with the pulsing idle. The cam is a crower nothing ratical 530in 531ex 110* overlap. I can enter more specs but I think I'm missing something simple and hopeing for a good tip. Thanks alot.