Coil pack vs viper coil mod

[Jeepmedic46]

My 2000 Jeep XJ is throwing a cylinder #2 misfire. Going to change my plugs. What is everyone using for spark plugs? I have the Viper coil mod kit. Has anyone put this on their Jeep? Or should I get a new coil pack?

 

[RCP Phx]

I run NGK ZFR5N on mine with a Screamon Demon coil and a MSD with the greatest results, tries some E3's and took them out 30 minutes later!

 

[Ralph77]

I just use the cheap Champions.
438's if I remember correctly.
Did the coil mod using a Mopar coil for the JK with the 3.6.
Doubt it is your coil.

 

[RCP Phx]

The ZFR5N is the same as a 438(RC12ECC), the only issue I had was opening the gap, I could only get .050" which is ok for my application.

 

[Rob Mayercik]

I just put a set of Champions in my 92 over the weekend as part of a tune-up.

What I rediscovered in doing so was that I'd been running a set of Bosch Platinum+4s for a number of years. It seemed to run fine on them, though.

For the misfire, could it be the wires then if you're using the viper coil?

 

[RCP Phx]

It doesn't even have to be electrical, the ecu monitors the spark output so injectors and valves play into it as well.