Greetings All. Have 2002 FLHR with SS Carb Kit, Cam, Vance and Hines dual exhaust. 3 Weeks ago it ran fine. Put in garage, went to get out yesterday. Barely started, when it finally did...it would not stay running without giving throttle. Put hand behind left exhaust, and it is 1/4 the air output of the right. When giving it gas, Right Exhaust...blows a good amount of black smoke...Left..nothing noticeable. Pulled Spark Plugs...black but not excessive. Cleaned them off. Any other items I should look for?