Sorry for the slow reply. To check the ECM (electronic control module) your best bet would be to go to a Harley dealer that used to also be a Buell Dealer so they can plug your Bike into a their computer used for that purpose. To check if its running lean check the spark plugs around electrodes. Tan or white ash too lean, Black may be too rich. Also plugs come in different heat ranges. Reseach on site or Google subject. Many opinions on this subject. Back should be a little richer than front because rear head gets hotter because of air flow cooling so they often make the rear richer to help this. Try to contact previous owner.