Dang, I picked up a engine miss :(

betcha its the edelbrock carb i had the same problem stumble at idle and a knock i looked everywhere for the knock almost sounds like the flex bolts have come loose on a torque convertor or a broken valve spring same weird knock took the carb off cleaned it shoved it back on and wa laaaaaaaaaa what the knock sound was still baffles me. Check your oil for gas in it and make sure yer running a fuel pressure regulator with that edelbrock.thats the first time ive ever had that weird problem but then again first time i ever had a edelbrock instead of a holley