I just found out yesterday that both of my oxygen sensors are trashed, they are causing a rough idle and check engine light on my car, plus a severe performance drop (my 1/4 mile ET is WAY off and the engine bogs badly on a full throttle launch.
So if it turns out my recently sent oil sample isn't lost in the mail, it'll be interesting to see how the nitration numbers turn out. I suspect these oxygen sensors have been slowly going bad ever since I got the car, since even last year when we did scan tool testing on it, the car was running leaner than most LT1s usually do (my 02 readings were around 830-850mv at WOT)