I have a 93 pickup with a 3.0 v6. When I start the truck the light is off, and when I drive for a while (different times) the light comes on. While on the trail it seams to load up a little, and will not pull good. If I turn the key off the ligh goes out so I cannot check it with the light. Could this be the o2 sensor? What else could this be? Thank You, Rob

 

Pull the code and go from there.

 

There are no codes. They are cleared at key off.