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 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.