ok , ive asked this beforebut i have a bad memory, what values should i be watching and what are good #s for them, i just want to give nelson the best info i can get him for tuning since i cant drive to his shop/dyno . I know the tuners want knock retard, long/short term fuel trims, and O2volts, (mine right now are B1-950,B2-940) I THINK THATS WHY IM GETTING RICH CODES PO172/P0175. and also IATs. what should i be writing down and what #s are ideal? THANKS.