Spark plug Motorcraft or AC DELCO

Do you have ngk or motorcraft sparkplugs?

Believe it or not I got the Genuine AC Delco iridiums from Home Depot for $3 a plug.

Problem solved: I got a internally bad ac delco spark plug. Gap and everything was correct no cracks I could see literally just a bad plug.

I replaced everything with Motorcraft plugs and wires and it has run great since.

I also put Motorcraft new plugs back in. Truck is happy. I'm happy.

I recommend nothing with platinum. I've had problems with those in my 1980 gbody with a 305. I just keep it simple with old ac/delcos now. Keep it simple for less problems.

switched to the back to the motorcraft spark plugs $15 a piece fixed it for a while

Problem solved: I got a internally bad ac delco spark plug. Gap and everything was correct no cracks I could see literally just a bad plug.

I bought eight new AC/Delco from eBay. While gapping the plugs, I noticed that in two of them, the ceramic was not concentric with the body of the plug. It's difficult to measure, but it's easy to see by eye. I'd estimate the error is about 0.02 to 0.03 inches.

I had the same experience and ended up getting a code. Swapped them out back to AC Delco and never had an issue.