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Review on πŸ”₯ NGK (3459) ZFR5N V-Power Spark Plug: Boost Performance & Efficiency with 1-Pack by Glen Needham

Revainrating 5 out of 5

Best spark plug for my 4.0

My 2001 Cherokee with a 4.0 coil pack engine had a slightly rough idle. The forks we used were fairly new, properly spaced, looked clean, and were the recommended forks. Tried a different plug. Fancy fork. No improvement. It might actually make it worse. Then I tried these NGKs. Always had great success with NGK in other engines and this was no exception. Idling is smoother and throttle response and overall performance are improved. Very happy. Feels like new again.

Pros
  • Absolute Legend
Cons
  • Low repairability