biz, if you haven't checked the torque (should be 18 lb-ft, I think) on your sparkplugs yet, take off the cover, remove the coils, and remove each plug and check its condition carefully. Then, retorque and put the coils and cover back on...

An occasional engine has been lost after the spark plug (usually in the 4th cylinder) backs off, disintegrates, and then damages the cylinder. This is the reason the spark plug recall was done in late 2002.

Best wishes. (and absolutely follow xviper's advice about the fluids).