Well I wouldn't necessarily call it a "problem" but just a "side effect" of a cold air intake. It is not really rough, but it is not as smooth as it was before I installed it. It really doesn't bother me. I have noticed that when I run the A/C it smooths out for some reason. Someone that posts on this board (can't remember who) told me that if I disconnect my battery to reset the computer and then drive it like I stole it that my idle would smooth out. I have not tried that yet, but I might. I think it is a good mod, despite the slightly rough idle!
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'97 Cobra, Rio Red, MAC Cold Air Kit, 3.73s, NGK V-Power
BBK H-pipe w/cats