MCN Chief Road Tester - Neevesy’s been an MCN Road Tester since 2002. He’s reviewed everything from mopeds to Rossi’s Yamaha M1, and plenty in between He covers tens of thousands of miles a year on ...

If it is also running poorly check the engine tune and things like the spark plugs, leads, filters, coils, and perhaps clean the throttle body. You really need to get a competent mechanic to check it.