idle problems

check for codes and go from there probably a sensor ECT,IAC, TPS or may be O2's

hey man, i have the same engine combo as you almost same intake, heads, cam, injectors... except i have a 65mm frpp tb, pro m 80, full exhaust, mallory ignition system and 3.73's (oh did i forget my favorite addition-my d&d viper spec t56 oh yeah!)
my car has never idled too well, i always have surges and stalls. i am in the process of saving up for AFM's PMS to rid my ride of all of its problems. e-cams suck in our cars, our computer hates them and it needs to be tuned to be fixed. i personally wont waste money on a chip, they are pretty expensive, generic if not custom, and they need to be worked over everytime you go for that next modification. i dont have the time, money or patients for that crap. i also dont want to deal with a laptop in my car, with one of those you always have to worry about battery life. its your car and your money but if i were you i'd wait and save for a PMS or something similar.
just my .02
fawcett
1995 mustang gts, frpp 340bhp 302, t56, brembos, and a bunch of other goodies