Also could be something with ur throttle body I Changed to a bbk and had the same problem for alittle while try re-seating the gasket around the throttle body Thats what I did
Go:Pypes mufflers, Custom H-pipe, Fidanza stage 2 clutch,SCT Tuner, American Muscle CAI, BBK 65mm TB, MotoBlue 42% Underdrive Pulley, 17/10.5 (315s) Black Cobras, Strut Tower Brace, Steeda Tri-ax Shifter With Pistol Grip Show:Mach 1 Chin Spoiler, Shorty Antenna, Sequential Turn signals, Bullet Pedal Set, Red Bumper Insert, Black Mach 1 Aluminum Louvers, Hood Pins
Beats:Pioneer HU, Alpine 6X9's Type R's(F/R)
UPS: Richmond 3.73 and Differential Cover.
Soon: Rear end rebuild kit and T-lok