Don't use Bosch sparkplugs

A little late, I put brand new Bosch plugs in my 2008 2.7 5spd and it immediately ran poorly. I thought the coil packs were gone, waited a week, put in the new packs and nope. Issue was 100% that the Bosch plugs are not a fit. Thanks rock auto/ autozone for both saying they fit. Thanks to the forum for being my double reassurance that I’m not mechanically retarded lmao.

 

What got me is the crank head who owned the taco before me has never changed the plugs over the course of 300k and it still ran “decent”. But the second I put some high end Bosch plugs like I did in my 2008 C6 corvette. Shit hits the fan.

 

As many write-ups as there are on this forum, why would anyone ever put anything but the Denso in? Use the forum and then complain I can understand but not use the forum and then complain is not smart, why even have an account.

That K20HR-U11 on your box is the Denso part number, also all over the forum.
https://www.densoproducts.com/denso-3381-k20hr-u11-nickel-u-groove-spark-plug

 

To be fair, I'm this way with gift cards/coupons. I hold them and never use them until I'm back in the truck after my purchase and it's sitting in the cup holder, clearly in view to remind myself to use before my next Home Depot purchase haha. It's only bright orange.