I have a restored 1950 Plymouth with a late-1980’s Chevy 350 engine. It has electronic ignition and a four-barrel carburetor.

When a car owner changes his spark plugs, Debris falls into one cylinder. After starting the engine, he asks for help and ...

Oily residue on the end (most likely to happen with two-stroke engines that use a gas/oil mixture). It’s also possible for spark plugs to fail internally, if their electrical components stop ...