Spark plug AC DELCO or OEM Subaru

Use the AC Delco iridium original plugs. Many sites will only show the double platinum as a replacement but every time I've ever driven an engine with those in it, it pinged or idled rough and iridiums always fixed it.

Over the years I’ve found that the factory recommended spark plugs typically work best. There are exceptions, but my ‘95 5.7 recently got some plain Jane ACDelco plugs and it is running great.

I just put in regular AC Delco plugs and it runs great.

Fresh AC Delco copper core plugs are all you need. Start with the stock replacements and go from there.

I just replaced my spark plugs on my 2012 1.4T with the ACDelco 41-121 ones.

Use only AC DELCO ignition components for GM vehicles, and that includes spark plugs. The factory plugs work perfectly.

Standard replacement CR43TS Delco plugs, and a decent brand of wires. Bosch makes nice wires. Our engines don't exactly tax the ignition system, so if it's functional, you don't stand to gain much.

I had the same experience and ended up getting a code. Swapped them out back to AC Delco and never had an issue.

RIP doing spark plugs at home and not hating life.

Good luck doing spark plugs