This may have been covered, but I can't find it. I have a flat spot about 3700 to 4300 RPM's. I have done the exhaust de-baffle, the intake mod. (air cleaners from Pep Boys,etc.), JSD, Cobra FI2000R. I am trying to get the flat spot to go away. The settings on the FI2000R are 2-3-4 at this time. I live at 4500 feet above sea level. Any thoughts?