long story short... blew the motor a year ago , now the car is back togeather , it idles a little high my a/f is at 12.5-13.5 when i give it gas or just crack the throttle it goes lean 16.0 then when the rev drops back to idle it shows 12.5-13.5 . it seems like it goes lean when you give it gas and let off the gas it goes rich, the car has not hd a battery in it till 2 weeks ago , check my sig for mods, i also have an o5 maf sensor with a mafia (set at 2)hooked to it, the car is tuned with the 05 meter and mafia on it with a blow thru setup on it ....my question is, is it possible to loose a tune if it hasnt been used in a year? or is my maf bad ? (blew motor on 9-14-09 if that helps) has new o2 sensors and no exhaust leaks