I just bought a 03 Roadking Classic EFI 17000mi. Stock Air box, Vance and Hines basic slip ons. Bike starts up fine. Plugs a little on the white side. Problem is, at low speed cruise 0% to 10% throttle or and thing under 35 mph, no load, the bike seems to surge or sputter as if it is starving for fuel or spark. If it is under a load its fine, cruising speed its okay. Also seems like idle is spratic. Runs up the RPM okay. Any ideas? This is my first Harley and I love the bike. Thanks in advance for your input.