Tacoma p0012 sensor

Ok going to try to put as much info as i can. Ok i bought the truck with 470k miles on it so its a project truck. I installed a JASPER engine about a month ago. Installed a bunch of other new parts. So it has new cam sensors, i also replaced pigtail on bank 2 because thats where my issues is coming from. Ive checked timing chain even though the whole engine is new but just for peace of mind. So before my first oil change it would shutoff while on the road and i would turn it on and would run but it would do this over and over again till i would get home. So i changed the break in oil the other day and the light didnt come back on till after about an hour before then i would erase it and it would come back on after 3 min of driving. Thinking of changing valve cover on bank 2 because it has sludge oil buildup and that might be throwing the sensoroff. Any suggestions?