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Get NGK plugs instead...mine have been working great.
I'm currently is20 United 91 octane tune, APR packs and NGK RS7 plugs (one step colder thant oem), gapped at around 0,028'' and car feels solid. No misfire, no EPC. However it honestly feels just like when I was with oem coilpacks and plugs. Maybe now idle feels a little bit smoother.
I’m now running factory heat range NGK 94833 plugs gapped at 0.03 and the car runs so much cleaner.
I don't understand why you didn't just get the NGK iridium plugs.
The plugs are great-- zero issues, can't tell a difference.
I've ventured from NGKs and always go running back.
I did reduce the gap of the PFR7Bs to 0.025" when I was running DriverMotorsports K04+ tune and it boosted more than 26 psi. I did so due to upper rev stumbling, but for being back to running my GIAC HO K04 tune...0.028" works. PFR7B usually work great with higher boost from turbos and tunes when you do notice the stumbling for having arc disturbance.
New NGK plugs were a definite improvement. MSD coils were not!
I’d never put autolites in a Jeep, send em back and get champions or NGK depending on year and model.
I quit using autolite plugs somewhere between 1995 and 2000, got tired of all the comebacks.
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