Spark plug Bosch or AC DELCO

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.

Belated follow up. I replaced the plug at the distributer as the signal from the hall sender was intermittent. Brand new Bosch plugs were had for cheap.

So I grab a new ignition coil, and a full set (4) of spark plugs. The Pre-gapped BOSCH Iridium plugs were the same price as OEM platinum, so I figured that's fine for me.

After pulling the plugs, Cylinder 1 plug was definitely eroded. The other 3 plugs looked fine, but I might as well replace the lot. The new Ignition Coil went into Cylinder 1 as well, and I started it up.

Check engine light went off, starts up fine, drives fine, idles fine.

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

Yeah, I'd rather use some cheap BOSCH SUPERS or other $2 copper plug than any Autolite.

Been using bkr7e since 2007. They are ok, but not optimal in any way. Im now running Bosch F5DPOR. \"OEM Audi RS2\" They are gap free, and runs perfect at least at 15psi in my car.

God knows they can only be as bad as the Bosch plat +4's, Man those are terrible in basically everything I've put them in... good luck!

Had bad bosh plugs before.

Never had a issue with OEM ac-delco or Ford plugs/parts.

Bosch is making crappy plugs these days.