Spark plug NGK or AC DELCO

Just did mine with ac Delco, gapped them in advance and running great!

In my personal experience (99 suburban 6.2l 383) AC Delco spark plugs are the way to go

NGK. I'm a believer after using them.

Went and bought the NKG plugs and the problems went away.

Most definitely still recommend! they are great, I usually replace every 50k due the stress I put my car under, but they can go a little more than that

NGK coopers for the coil pack Jeeps. Mines an 00 and have ran champion and NGK. NGK are doing alright in mine

I have ACDelcos in my 2010.

I've changed them twice over the 120k or so that I've had the car and I didn't pay attention to what was in it when I bought it, but the person who owned the car before me had a receipt from Advance.

I’ve been running NGK Irridium tips for 30,000km and haven’t had any issues

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.

after putting the new ones i changed all the spark plugs too, to fit them properly with new wires. but the car runned roughly, so bad..and when mechanic unscrew the new spark plugs to see, they were carbonized black, with just a ride around.