Nah, the CEL has been on for a while, but just recently I took a bit of a hit to my gas mileage. I'm pretty confident that it is going to be the MAF, but I will clean the airfilter anyway. What do you mean by electronic parts cleaner? Is that just something they'll have at my parts store? Cuase i already have some K&N filter oil, but not sure if it will work with this non K&N filter.