first off 2 things
1. tell me u didnt gap the plugs urself... u dont gap those urself.. u can and will scrape off the coating on the diode.. Hopefully they were pre-gapped in the box...
2. i know this may sound dumb but did u plug ur MAF back in? alot of people believe it or not do it.... now on the stumbling issue with the CAI's... make sure all hose clamps are nice and tight especially on the throttle body... they can easily get pinched and leak...
now when u installed ur CAI did u inspect the butterfly on ur intake? and also did u clean ur MAF? I would recommend cleaninh ur throttle body and ur MAF 2-3 times a year sine u are usin an oiled element air filter... many people have had MAF issues from the oil comin off the filter and caking the sensor... get u a can of MAF sensor cleaner and clean it and get u a can of deep creap for the throttle body and if u gapped ur plugs urself ur gonna need new plugs...
also how many miles do u have, what make and model, 2wd or 4wd?
1. I verified the gap on the plugs with my feeler gauges, a couple were off a little so they had to be adjusted (one was too wide and one too narrow). My feeler gauges are incredibly smooth and couldn't scrape off the coating IMO. - I don't use the 'gauge wheel' type.
2. The MAF is plugged in and all connections are tight.
3. I did not inspect the butterfly in the TB.
I did clean the MAF Before I installed the K&N about a week earlier.
4. 2002 Tahoe Z71 4WD with 163,000miles