Champion are ok if you change them every 2000 miles, otherwise they tend to loosen up at the terminal and you end up having to retighten them on a rigid mount Harley every 500 miles or so.
I run Champion plugs in my Harleys. I have never had an issue with them and when I did try others, I never noticed any improvement over the Champions.
In a pinch I use champions.
The proper champion plug is the "QL77JC4" gapped at .030".
I just got a new to me 2016 f150 with 120k. Did air filter, cabin filter, spark plugs (had a misfire) and boots and oil change. I used champion plugs but most reccomend OEM. Got a wix air filter and a fram oil filter. I used full synthetic 5W-20 Valvoline R&P oil. Use rock auto for parts if possible.
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.
I’ve been running champion plugs for about 40k mi without issue.
But yeah, switch to another brand and stop using champions.
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