[wiswind]

The shocking from the vehicle with the engine off that you mention has nothing to do with the coil......it is static electricity.....I get the same thing.

As far as the coil pack and fuel economy.......some people are more sensitive to a slight miss in the motor than others.....I remember years ago my father mentioning their vehicle was running rough.....my mom thought it was running just fine.....she only noticed a problem when the engine quit....as long as it was running......she did not notice anything else.

The testing that Tripletdaddy is spot on....however the cracked epoxy issue will NOT show up in this test......the high voltage arcs through the crack....however a ohm meter check will find this path to ground as an open......the voltage is jumping an air gap.

In my case.....if I am going to take the coil out to look at it......I would put a new one in.
The reason is, many times you will see the carbon tracks......or a crack......but it is possible to have this and not be able to see it....particularly as it will not be squeaky clean back in there.

As you well know....these "sorta bad" issues are a lot tougher to track down than a solid failure.....so many "It could be's"