Spark plug NGK or BERU

I replaced the plugs again (from Brisk to NGK R7437-9) and rotated the coil packs to try and resolve the misfire issue. I also re-flashed both the ECU and TCU tunes, and the cold start misfire issue appears to be fixed.

Atualmente uso velas e bobina NGK. Perfeitas.

I’ve been a Toyota certified master diagnostic tech for nearly 30 years. I can tell you that I’ve seen Toyotas come in running poorly and all we do is scrap the off brand plugs with either NGK or Nippondenso and the car runs fine again.

Based on your parts list, I'd recommend getting the Denso or Hyundai branded ignition coil. Denso is the OEM for Hyundai. For spark plug, get the NGK 9723. These are the OE spark plug for Hyundai.

I've had misfiring when I installed it dry and torqued to spec on my Civic 8 gen. No misfiring after anti seize...

Just changed the plugs on mine @ 75k 2 weeks ago. DIY EASY! Installed the NGK Laser Iridium ILKAR7L11 94124 plugs. Old ones screwed right out.

I change spark plugs - I change my plugs every 30,000 miles spend the extra money for NGK.

Only ever buy ngk plugs and learn to read their reference chart then you will always know what plugs you can/can't use for small engines

So, I changed spark plugs in an old Ford Focus 2001. And currently there's no way I can get the original Motocraft spark plugs, so I bought and installed the NGK ones which are supposedly compatible with my vehicle. I used them a week, but since the start I noticed great differences in size in the threads and in the shape of the head. Is this a problem?

I bought some NGK from RockAuto and they only lasted me 15k miles. I just ended up buying the FoMoCo ones from the dealer.