When I order NGK spark plugs, I get NGK spark plugs, not some copy.
The AC Delco Iridium are fine failing that anything NGK the NGK ruthenium work well. Or the NGK Iridium
I replaced all spark plugs with Genuine Audi NGK plugs and replaced all Ignition Coils as well.
After changing: Idles better and more consistent at 700~800 rpm range. Car drives smoother? Changing spark plugs made it visibly better.
NGKs are my go to’s
I've run Denso and NGK on E85 for 10k+ miles and numerous track days, with zero issues.
Holy shit - $75 spark plugs? I think my Honda plugs cost like $5 a pop for NGK iridium
Also check the spark plugs, sometimes people are cheap and buy autolites instead of NGK. Cheap plugs from previous owner give me a headache.
I’m lucky if I get a full 5k miles out of a set of ER10S before one of them shits out and I get a misfire.
I changed my plugs for NGK IRs but now I have a rough idle when the engine warms up.
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