I have a 2012 FLHTK and recently added a V&H Pro Pipe ,Fuelpak 3 and Cobra Power Flo Intake with K&N Filter . Once the motor warms up the RPM will vary between 980 & 1450 . I checked the breather lines from the heads to the air filter and everything was clear . I believe the vent from the heads to the air filter feeds the gasses to the fuel injection causing the motor to surge . I flashed the ECM with the correct tune from V&H but have not ran it in Auto Tune since the tune from V&H should be the best tune . I have not made any changes to the Throttle Progressivity . Any had this problem . Any solutions or suggestions would be greatly appreciated . markwpat@aol.com