I just replaced my left O2 sensor the other day. I also replaced the air and oil filters and oil also, switched over to mobil 1 trisynthetic btw. Anyway i drove fine to my uncle's house for thanxgivin, then when i start the car to leave i realize the idle's rough..hmm weird. Then upon acceleration, I get 1. shaking, 2. hesitation, 3. lack of power in general. It does this at any speed when throttle is applied. Any thoughts? Have I screwed anything up during my fix?