I think my o2 sensors are probably going bad. Here is what's going on. I have a wideband and I see it going from 14.5-14.7 to 15.2-16 @crusing. I will be crusing around 50 running fine, come to a stop still fine then I get up to 50 again and it will read 15.2-16, stay there for awhile and then drop to the 13's and then to14.5-14.7. At WOT its 11.9-12.2. What could this be? I haven't done anything diff. Haven't changed anything out. My SSS was tune about 3000-5000 miles ago and I currently have 58000 miles. Can it be the o2 sensors?