gauge reaches normal? In the last 2 weeks, my SUV has really been cutting back and having no get up and go first thing in the morning when I leave for work. It ONLY does it when I first leave and the temperature gauge hasn't reached normal temperature. I first had a code for misfiring spark plugs so I had the spark plugs, wires and a fuel cleaning done. I drove it the next morning and it still did the same thing. Check engine light came on again and it said Warm Up Catalytic Converter Beyond Threshold Bank 1, so I was told it was the upstream O2 sensor, so I had that replaced, only to get in it in the morning and have it do the exact same thing as it has been doing. I am not sure what to do next. Any suggestions? Thanks in advance!