I'm still tunning my rebuilt L69.. Starts and idles ok until it warms up and then it will die when I'm setting at a light... Idles pretty low at around 550rpm. I do have a com cam 262 in it and WP heads.. I hooked up a vacuum gauge to the carb and when it starts running rough at low idle, the vacuum jumps from around 15-16 to around 10 and backup.. Do I just need to increase the idle speed with this cam, or is something else wrong?