I may have replaced it way back when... in an effort to troubleshoot the idle issue.. I"m not sure. So.. I've got this wired to the MSD 6AL box, to the coil. Not using the Chrysler ignition module box (per MSD instructions)... and I'm using an MSD Blaster 2 coil.

So - to check the air gap .. what should the measurement be? can I just use a credit card to set the gap? Or is that not the proper measurement?

Also - what are the best ways to troubleshoot the ignition system to ensure it is providing adequate spark at idle?