I just went through this in Dec.
I replaced the coil and it cleared the code, but I still had a rough idle. Swapped plugs and cables, all is good now.
Change the plugs on the passenger is a bitch.
2007 JK Unlimited
TeraFlex 6inch Long Arm
Front EVO Double Throw Down Coilover + Triple Bypass
PR44 HD Unlimited w/Reids and RCV's
RockJock D60 Rear
37" Nitto Trail Grapplers
Red Rock Fab Front bumper w/light tabs
EVO Tire Carrier and Skins
GenRight Full Cage - in progress
Lowrance Baja 540 GPS