Ok, I have tuned a lot of cars and never had as much problem getting voltage offsets right as this car. I'm using injector nation In900 injectors and used his offset chart, however it's not helping too much. I'm using neptune and my trouble seems to be around the voltage issue. First off, at idle with nothing on, I'm reading 14.0-14.2v output and can get it to idle at 14.7, then I toggle the fan on and turn the lights on and voltage drops to 13.7 and af leans out to 15.8. I then adjust the 12v offset until it goes back to 14.7. When I turn the light and fan off, it is now 14.0 af. I adjust the high side and the story repeats. I'm going to try adding a 13.5v point and a 14.5v point to see if this helps later, but unsure if any of you have had this issue. Not sure if this is a symptom of an alternator going out and not producing enough amps. I can't really tune the car this way as every time the voltage changes the tune changes except under full throttle which is a sign of offsets being off.