I have noticed that the NGK plugs are overly fragile. I think we should all look for some other brands, like Bosch or … something else. What is the icon for a "pad on the back?"
I had to order from rock auto. Nobody around me has them. Good thing was they are only 10 bucks each from them and other online places want 13 -15 bucks. The thing that sorta pisses me off is when I bought the car the dealer said they did a compression test as part of the ppi and you would figure they would have thrown a set of plugs in.
Does the miss go away when you rev the engine? If so, you might have a vacuum leak. Check out your long and short-term fuel trims. They should add up to around 0. Compare both banks. If the fuel trims are way out of line, you may need to use a smoke machine to find the leak.
I don't think a vacuum leak will hold up. The misfire followed the plug. So it is not a vacuum leak. The one cylinder misfire will cause long term and short term fuel trims drift.
They have the same mentality many of us do. It's only been 2K miles, it is still good. I really don't know why the skinny NGK plugs don't last long. My 328 with its $2 copper plugs last a loooong time. The 355 with $15 Iridium NGK, not so much.
I agree. I had regular autolite plugs in my work van that went 100k before i got a mis. Granted it doesn't rev like these do but my car only has 16k on it and they may have been changed at some point. Like you said we need to find a better plug.
Sorry I forgot to post the results. Changed the plugs and took it for a ride the other day. Runs like a champ. Smoother than it has since I got it. I guess these engines are very plug temperamental.