OK I HAve a big problem. I have a 2001 sentra se 66K ... and last night i started it up and it began to idle very loopy. then when i drive it it would keep bogging very very badly and all i could smell was fuel and it sounded like"put put " i have no cvlue wht could be worng the only thing i can think is tht my secondary 02 sensor which is not hooked up ...but this hasnt been hooked up for 2 months and i have not had a problem yet... this happened all of a sudden last night ...but earlier i had been spinning tire in the rain so maybe my maf sensor is busted.. Ne one have ne help for me??