i hooked up my a/f meter a few weeks ago, i drove the car for a week and it was working fine (green LED at WOT- rich). I left for school and i did not drive it for 3 weeks- my dad occasionally started it, but no one drove it. When i got back, my meter wasnt functioning properly. During normal driving, and at WOT, it is at like the first or second red LED (lean), and at idle it flickers between either stoich or no LED's- i checked the connections and they're fine- would it be my o2 sensor because it has been sitting for a while?? thanks for all your help