Spark plug query

[Jrod]

I just changed the plugs on my 100 yesterday and the 2 rear most spark plugs on the passenger side had a gasoline smell (not horribly strong, and were a little wet). The rest of the plugs were dry and didn't have the gasoline smell. The check engine light has not come on.

Anyone have thoughts on this? If it was a bad 02 sensor the whole bank of cylinders on the passenger side would be running rich, correct? I've not seen this happen with a coil on plug engine before.

Thanks in advance.

 

[Bomar]

I would think that it could be a tell sign the last those coils might be going out. Not enough spark to completely burn all fuel chamber

 

[duggy]

I thought coils were always an on/off issue? If they went bad then they went bad

 

[Trunk Monkey]

Fuel injected into the cylinder but hadn't fired when you shut the truck off maybe.