really need some help..
ok, here's the situation: when i run around town for awhile & the car is good & up to temp, sometimes it'll buck some at highway speed. never when cold. i get a cel code of 1151, which , if i'm getting it right, is upstream bank 2 o2 sensor. haven't replaced yet. i've heard 2 different things about this. injector is possibly leaking, or it really is the o2 sensor burning out. if it was the o2, wouldn't it buck all the time? i put new o rings on my injectors this year, along with new plugs, wires, & coil packs. no vacuum leaks that i can find. whatever it is doesn't show itself till really warmed up. what is this?? would really appreciate any help, thanks guys..