Hello to chevy lovers, I am a proud owner of a 1990 corvette and i am always ***** out with my car. but lately i have been having idle problems and bad gas milage from 19 mpg to 12.3. now ive changed O2 sensor, fuel pump, map sensor, IAC sensor, cap and rotor, plugs,coil, and installed a new adjustable fuel pressure regulator and fuel pressure is good after. now whats killing my mpg and can it be a simple sensor or injectors.

 

Need to have it scanned for trouble codes. Does your "Check Engine" come on while driving? The "shotgun" approach to fixing a car is usually very expensive and time consuming. [8D]