So I was taking the Giulietta to Petaluma yesterday to look at a Kaiser Deluxe (don't ask). Five miles down the road it burped/hiccuped, then ran OK again, but it had been running a bit off and I took a second warning to heart. Got off the freeway, idled home, seemed to make a sound a large throttle openings, didn't seem related to rpm. Sounded more like pinging than a mechanical sound. Got home, took the plugs out for a first look, found #3 NGK with the electrode gone. Still firing on that cylinder but not well. I'm guessing the hiccup is when the electrode let go and went out the exhaust. I looked around with a bright light, didn't see any damage in the cylinder. Put new plugs in fired it up, all good. Did a compression test, all about 190, just like when I bought it from Bill Gillham 12 years ago. Whew.I got a Reinz gasket set from Jon Norman recently and it came with a lip seal that must go to the tach drive.