[marty matthews]

I need some help with an idle problem on my 65 GTO. It is a tri-power car. When I first start the car, it starts fine, and the choke keeps it idled up until it warms up. It then runs great and idles fine for about the first 20 minutes or so. Then, when I pull up to a stop sign or light, the engine idle drops, and it wants to die. If I keep my foot on the gas just a little, it idles fine. It almost seems like I have a vaccum leak? I have adjusted the idle on the carb, and it has fairly new points and plugs. The car runs great otherwise. This problem just started this year, and I haven't changed anything recently on the car. Any thoughts on what could be making the idle drop after about 20 minutes of driving?