I've got a 2006 chevrolet cobalt 2.2 L . When I start the engine it idles fine but when i accelerate then relase the gas pedal the idle fluxuates then dies out . I hooked a scan tool to it to read codes . I found 02 codes and MAF code . I then switched over to monitor sensor functions . I noticed 02 sensor # 2 is not reading and MAF is at 0 . I'm thinking the MAF is the problem ?