Having a misfire on cylinders 4 and 8 this past week . Now occasionally on 3.
Engine started knocking occasionally on the drivers side.
getting a knock sensor 1 low circuit input code and a system too lean on bank 1 and 2.
just changed replaced plugs and wires(silicone ngk)
I run 15w40
​​just replaced the thermostat with a 180°
I use green coolant
Replaced head gaskets about 3 years ago
Replaced upper and lower intake manifold gaskets about 3 months ago
also cats were stolen so its now straight piped
And the engine has 304k miles on it
Any help on what to do would really help.