Hello,
2005 Mustang GT - A couple weeks ago my check engine light came on, and my SCT XCalibrator 2 got: P0506 - Idle Control System RPM Lower Than Expected. I cleared the error, and so far it hasn't come back. Any tips on this? Current mods are JLT ll intake with custom tune from Evolution Performance, H&R supersport springs, and SLP axle-back exhaust. I've had these on for at over a year with out issues, and the car is running fine from what I can tell. Thanks in advance...
John