Are you sure you aren't mistaking cams for a vacuum leak?
I kid, I kid
Seriously though, a common misconception is that all cams will generate serious lope at idle. The cam profile and amount of overlap determines how "rough" your car will run. A cam with higher lift/duration will achieve that lope over a mild cam ground for a mild street build.
12 Black GT500 SVT PP l VMP TVS l JLT123 l O/R X l 28x11.50Rx15 M/T Street R's l BMR Suspension l Recaros
03 Sonic Blue 3.8 / 17 Magnetic Fusion Sport 2.7 EB