I find it hard to believe that Thumper won't help after you bought a carb from him. He helped me before I ever bought any thing.He is one of the better vendors here. I had an issue similar to yours just opposite symptoms.Its hard solving tuning issues on a web board. Can you call someone or bring it to someone for 2nd set of eyes? Whats funny the person who actually figured out my issue was BigDad's favorite person...lol