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OFT tunes change nothing to do with air conditioning system
only the engine ecu paramaters are altered
You can get a laggy throttle after a flash, read links below re Flashing Reset Learning
Cruise control is disabled on P0420 cel code, is cel light on , check for error codes
is your header stock or aftermarket catted header some will trigger cel code P0420
note any error codes then reset with oft.
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