On the V-6 engine, oil in the spark plug tubes can cause a misfire. Resealing the tubes as part of replacement of the valve cover gasket and replacing the spark plug wires will commonly repair this issue. On newer models the misfire can result in illumination of the Check Engine Light.Google+
Car Problem Reports
Isuzu Rodeo Oil in Spark Plug Tubes May Cause Misfire
Isuzu Rodeo Problem
Engine Affected: 3.2L V6
Average Mileage: 163,882 mi (123,000 mi - 199,688 mi)
started skipping, then check engine light came on. Had advance auto run computer on it and the reading said it was a misfire in the cylinder 6
Visitor, 1997 Isuzu Rodeo, 3.2L V6, 123,000 mi
Oil leaked into spark plug holes and shorted out the coil wires and cause a misfire in the right bank. This also caused the cat's to go bad and the 02 sensors had to be replaced!
Visitor, 1997 Isuzu Rodeo, 3.2L V6, 158,015 mi
My check engine light came on, so i took it to Auto Zone. They ran a diagnostic and said it was the 6th cylinder misfire. So my husband and father in law took the spark plug out and there was oil on it.
Visitor, 1997 Isuzu Rodeo, 3.2L V6, 186,471 mi
oil in spark plugs