Best Spark plug for Jeep Wrangler

Stick with Champion plugs in the 4.0L inline 6. Anything else will have you chasing a “stumbling” idle.

I use champion on my 04. No issues. The more expensive ones that’s when the issues start

I use Champion in my 02. Never had any issues.

On my old Jeep Wrangler, the only plugs that it ran well on were NGKs.

If these are for a TJ (97-05) return them and get NTK (NGK). The 4.0 will not like anything else.

I’d never put autolites in a Jeep, send em back and get champions or NGK depending on year and model.