Spark plug Autolite or Denso

DENSO , Iridium Long Life, SK20HPR-L11 Spark Plug

I would stick with the specd Denso, leave the coils alone.

I recently was having a misfire in cylinders 2/3, and new plugs and ignition coils cleared it up.

I have a 3.5 ecoboost. All 6 of my Ford plugs failed because of cracks. I replaced them with AutoLite iridium XP5863. They are all still going strong after over 50k miles.\n\nThe Ford plugs failed with a cylinder misfire error code. The engine would also bog down under havy accelaration

DENSO ZXE24HLR7 is also an excellent OE plug.

I already replaced the spark plugs with the Denso ones I listed though... Is this bad?

I highly recommend avoiding anything other than exactly what is specified in your owners manual, I currently have bad gas mileage because I was too curious to see if the desno two tip would do as good as the other stuff.

I agree with everyone saying NGK but I would also like to recommend you do not buy an autolite if you need a substitute, they have horrible quality control.

definitely not ok, they are spent, also Denso>NgK any day of the week

Probably going to need to pull them again within a couple years. Autolites are the absolute worst sparkplugs.