Ok so it turns out it was not the plugs but the wires...more specifically the connection between the wires and the plugs. Long story short the connections on 2 plugs were loose. It was hard to notice...wasn’t arcing or anything...but the wires seemed slightly loose. Basically I just reshaped the connectors a bit and after that everything snapped together. Truck seems to run perfectly now.
...other than the down stream o2 sensors which are both pegged ~800mv and the short term fuel trims which bounce between 0 and -4% but mostly between 0 and -.7%
I guess next thing is to swap the o2 sensors.
...other than the down stream o2 sensors which are both pegged ~800mv and the short term fuel trims which bounce between 0 and -4% but mostly between 0 and -.7%
I guess next thing is to swap the o2 sensors.