About a month ago, I descreened my MAF and took off my stock throttle body and did a few things. One of which was to use some stuff called fast steel to fab my own air foil thing. The stuff worked great and after it dried I ported and smoothed out everything. I plugged up the pcv part with the fast steel and now use a breather on the valve cover instead. Also, I had to drill a hole through the newly made air foil for the IAC. When I put the TB back on the car and ever since then,.. when I cold start my car it idles unusually low for about 5-10min. Once it warms up and has been running, the idle is normal again. I have stock tuning. I'm figuring its most likely that the hole going to the IAC isn't big enough. I was looking for a few opinions before I go drilling it out more.

 

geeze! dont all post at once now...

 

Only thing I can tell you is to find out what size holes an aftermarket airfoil has and drill them to that size.