Rough cold start-- 4cyl Camry

[BlackG5]

Hey, this happens only on occasion, but in the morning, my car will almost sputter as its starting up. There are no strange noises or anything, but its like the computer is getting false readings from the maf, causing the stumble. The car always starts right up, and its not an issue, just curious to see if anyone else has something like this happen..

I cleaned my K&N last week and it started flawlessly until this morning-- I think there may be some oil on the maf or something..


also, there is a metal honeycomb filter in the stock airbox--- is there a way to replace it? with 175k miles, im sure there is some junk stuck in it....