Funny Idle?

[Sil80315]

Ok i just put the motor back together and Im running Step 2 HKS cams, with BC springs and retainers, now at idle (9-1k) it sorta sounds like its misfing but at the same time it sounds like it has lumpy cams, but it shakes the whole car, but the idle stays steady and doesn't bounce around when its doing this and its only at low rpms. Im also running nismo motor mounts.

Another thing is that the car is running rich at idle because my nismo FPR broke and the stock one is giving the car 50psi fuel pressure at idle so its running pig rich. Im just wondering if both of these are the cause of why its idling like it does. thanks

[IanS]

pig rich and lumpy cams will do that, just to be sure you could check your spark plugs to make sure you dont have a cylinder that isnt firing.