I have an 04 speedmaster 15k.on it. The last 2 weeks it has started to back fire in the left carb and run rough. I changed out the plugs they looked all right. Not lean or wet. Ran ok for a few days now back to the rough idle and starts to die then burps and runs. Ai removed had a dyno last year did not change any jets. Has TORs on .... I am at a lose here.
