Spark plug Denso or AC DELCO

The coils I replaced with oem and the spark plugs Denso IKH24.

Also, did you even replace the spark plugs with Denso IKH24's? Probably not and that is REQUIRED in order to run correctly.

On 02/18/2016 I switched the plugs with the Denso IKH22 at 15800miles. Jetta is more rev happy. No slow down throughout rev range, and no more pause hesitation between 3.8k-4k RPM. Just pulls, and pulls even harder. Also idle very smoothly.

I switched to the Ikh24 and it really smoothed the car out.

I paid $42 for the ACDelco iridium plugs, $45 for the ACDelco pro wire set.

GM products run best with AC Delco plugs, just like Ford products run best with Motorcraft or Autolite.

Replaced my OEMs this summer to Denso K16GPR-U11 and has been getting really good mileage and smooth idling since then. Now planning to try NGKs next time.

I did put ac delco factory iridium plugs from rockauto on mine at 100k.

Changing the plugs from bkr7e's to denso ik27's helped a bit too.

All the recommended denso plugs have the wrong gap. They list 1.1mm gap for the 2.0t The recommended gap should be .7 to .8 mm Plus the "20" heat range misfired a lot in the cold for me (about 20 deg F)