One thing that i argued with a guy at C&L over the phone was fan wash. He said if you run a cone filter right in the bay it will catch air from the fan and surge your idle. It personally never happened to me but...if all else fails check it.
Im pretty sure Im just running Rich. I wont know for sure til I hook up my A/F Gauge, but that car runs very strong when its WOT, but just idling its very jumpy, and definitely needs to warm up first