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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I guess thats the next step, its just wierd that mine has this problem. plenty of people do hci swaps without a tune, and dont have this problem, right?
Calibrate, run the KOEO self-test, confirm calibration, check for vacuum leaks, run the KOER self-test, how's the engine vacuum reading doing?.....need to get the information that will help you fix it, unless you have a Z-cam or +15° overlap @.050" cam.....it's fixable.....or pay for a tune.