Hi, all. Have a perplexing problem. I've got a 66 GT convertible that is driving me nuts. Car runs great, has plenty of power but at idle has an annoying pop in the exhaust. It's not very loud and is intermittent but seems to become more pronounced as the car heats up. Does not seem to cause any drivabilty issues. I've tried adjusting the mixture screws on the carb, adjusting the timing and adjusting the valves. All with no luck. Anybody got a suggestion? I'm fresh out of ideas.