520 RB with a 1050 dom.i got my in gear idle at 14.5 on the afr guage.kruz is at 14.8.So i go to the track to do some t&t and they tell me i have to run a air filter(no hood).I have a K.N 2 in. by 14 w/a mesh top.when i put the air filter on, my AFR goes thru the roof.If i rev it up i can get it back down to 15.00 but then when i let up it goes to 17 then off the chart.i take the air filter off All is good.what the heck is goin on???