When I start the car from cold, let it warm up, and leave work or home, the car seems to lack power in second only. Nothing serious. When I get on the 406, and go through the gears, and IF I sit at 3100 or better the CEL comes on for about 30 secs. No lose of power is noted. I hate lights coming on so I checked for codes, but there were none to be seen. It only does this per start up and won't light the CEL unless I shut off the car and let it go cold. Wondering if this is a O2 sensor going on me or does anyone else have a sugestion?