So I have a cai on my 03 5.4 and have been getting the cel started a couple months ago with just bank one, now it's bank 1&2 and I've had the shop smoke it twice and they haven't found a thing. My o2s are good.. Would it through codes If the filter wasn't properly oiled?
Any help would be very appreciated!!!

 

Clean your MAF and put the stock intake back on.

 

If youre running lean you will need custom tunes to correct it. Or do what was suggested above.

 

Thanks guys!