[gearheadred]

I've seen many threads on here regarding misfires right after plugs are replaced. Well, I just replaced mine at 42,000 miles and went with the NGK 5992 (gapped to .022"). I had no misfires before but picked up a bad misfire on cold starts immediately after replacing the plugs - throwing misfire codes on multiple cylinders at every cold start-up, but not at any other time. I was certain it had to be plug related since the car ran perfectly before. Since my car is tune-only I then took the plugs out and re-gapped them to OEM (.027") - all misfires gone, and picked up about 3 mpg. Seems like a lot of these issues could be resolved with a simple gap adjustment. Just something to try before replacing parts that may not need replacement. Thanks

[ksalih]

Good info. what mods are you running? I've heard the 5992's run well when you aren't running stock boost and gap them correctly.