Spark plug

[Bill R.]

Do a compression test on that cylinder.... no compression=no combustion=wet spark plug.

[bsell]

Do a compression test on that cylinder.... no compression=no combustion=wet spark plug.

The OP said "wet with gas." Your theory holds with compression leaks from both worn rings and bad valves, right?

I figure bad rings would leave oily, blackness on the plug which should be very easy to see that it isn't 'gas.' Unless the OP's car had 'virginal' oil...

Either way, a compression test followed up by a leakdown test for the weak cylinders tells much.

[Bill R.]

Not always, the plugs aren't always oily from bad rings. With no compression its very hard to get the gas to light so you end up with gas soaked plugs, doesn't have to be oil fouled.

The OP said "wet with gas." Your theory holds with compression leaks from both worn rings and bad valves, right?

I figure bad rings would leave oily, blackness on the plug which should be very easy to see that it isn't 'gas.' Unless the OP's car had 'virginal' oil...

Either way, a compression test followed up by a leakdown test for the weak cylinders tells much.