I recently installed a Stillen Hi-flow intake kit and 5/16" plenum spacer. My idle isn't rough, but it's about 300 rpm lower than it used to be. From time to time I also have issues with it dying on startup unless I give it a little gas so it doesn't dip too low.

I'm guessing I have to do the ECU reset process, but I just saw someone mention MAF cleaner? What's the best route to take? Is that ECU reset pedal dance pretty simple to do?

 

Follow the Idle air volume learning procedure - should be included w/the spacer. Or go to motordyne.com and download the manual.

 

If you have a good idle then you have a good seal at the spacer.
Try reinstalling your stock air box. CAI's can sometimes cause stalling.

But as mentioned above, you may just need a idle air volume relearn procedure. Easy fix.