Hi Nick,
Thank you for your reply. I realize this is not "pixie dust" to solve a vehicles problems. If a car or truck is sick, the groove will help but the results will be tainted by the "sickness". My 2002 Silhouette has the original O2 sensors, which have been setting codes. As a mechanic at a GM dealership, I am surrounded by people that think anything "alternative" is way outside the "acceptable" box. As the movie line goes, "if you build it, they will come." In this case, I will rephrase it and say "If you Groove it, they will come and bring others of like mind". Thank you again.
By the way, did you find the deer?
Scott