Just sharing my problem.
I installed a aps dr 725 fmic and aps cai on a cobb stage 2.5 car(I have access tuner)
Started the car following installation and it ran like *****. Well I figured I had a leak so I checked everything. Started the car still idled like *****!. I figured I am missing something somewhere and it is very hard the hear for leaks so I used a pump to the pressurise the system. No Leaks??? Took the car for a short cruise around the area and it also bucked coming on boost and badly when in 5th building boost, threw a code PO171. Took it home and scratched my head for a few days. I then recalled some issues I had when my aem was on the car. So I hooked up the stock airbox with it sitting on the ic piping. Started the car and it idled perfect! I pulled the cai (to be reinstalled on vacation in a few weeks so I can tune the car) and siliconed the air filter to the top of the stock airbox and hooked it up(the whole box won't fit). Took the car for a spin and it ran like a scalded dog. It seems the issue was a poorly placed maf sensor in the aftermarket cai. I am very disappointed in aps as their products are very $$$ and I would think they would do thier homework.