I have an Edelbrock 600 carb that's about 4 years old. I get a slight stumble when I take off and sometimes when you increase the throttle from a cruise speed. I notice a little moisture around the accelerator pump rod but not a lot. I have disconnected the choke and wired it open just to see if the choke had anything to do with it. There was no change. The timing is right on and the engine has only 10,000 miles on it form a complete rebuild. I replaced the carb base gasket also and there are no vacume leaks. When I look inside the carb and touch the throttle it looks like I get a positive spray. Does it still sound like the accelerator pump could be the problem or should I turf the Edelbrock and go for the 670 Holley Street Avenger. Any thoughts would be appreciated.