I have a BR 600 that is running fine 90 % of the time and misssing or something part of the time if yo let off the throttle then get back in it it is sometimes fine and sometimes continues to miss or whatever it is doing... I bought it new and it was this way immediately. Dealer said they ran 2 tanks through it and can't get it to act up. They said they can't really try anything b/c if it is not a problem warranty won't cover it and it will be on me. Try again and let us know. What are my options..