Rough idle can be almost anything. Pull a couple spark plugs and check the gaps. Check for a loose plug wire, change the fuel filter. On the SC engine, pull the cover and check to see if all the vacuum lines are hooked up and not leaking.
DON'T buy cross-drilled rotors. The drilling process weakens them. They were designed for racing, and those guys swap em out EVERY race. Any Nascar fan that'* seen a rotor explode knows what I mean. The BMW and Ferrari cross drilled rotors aren't drilled. They're cast that way, so they aren't as weak.
Buy slotted rotors. 95BonnevilleSESC and I are both running the RSM'* and they're AMAZING with ceramic pads. They bite harder when they're hot instead of fading, and you'll see a vast improvement in wet braking.
Speedguy can get you RSM'* for a great price at www.domesticperformance.com
or email him at firstname.lastname@example.org
or pm him here at Speedguy.
Hector can probably get you a deal on powerslot rotors at www.angryducktofuracing.com
or email him at email@example.com
, or PM him here at 99BonnevilleSE