I need some help. I drive a 99 Wj. It has a rough idle and at speeds between 50-60 at 1500rpm i have a bad vibration, an engine vibration. Now i took it to the dealership to have them look at it, which they say I have a bad pcm. I just wanted to get other peoples thoughts.

Error codes that were pulled:

P0301: Cylinder # 1 Misfire
(Misfire detected in Cylinder # 1.)

P0300: Random/Multiple Cylinder Misfire Detected
(Misfire detected in multiple Cylinders.)

P0302: Cylinder # 2 Misfire
(Misfire detected in Cylinder # 2.)

P0352: Ignition Coil B Primary/Secondary Circuit
(Peak primary circuit current not achieved with maximum dwell time.)

The codes 300,301 & 302 are related and probally 352 might be setting them. before you buy a pcm check for loose connection and arcing. Take a spray bottle of water and spray onthe wires and coil connections with the motor running to check for arcing. Measure the coil resistance coil b should be under 2 ohms. If you have to buy a PCM its big Bucks from the Dealer try a salvage yard first much cheaper or if you know someone who has a Jeep same as yours swap the computer to see if condition exsists.

which coil is coil b?