04 Chevrolet Silverado misfire
Cylinder 1,2,3 and 7 are misfiring pretty badly. I’ve
replaced plugs, plug wires, and checked coils. I
have a bad O2 sensor as well. Any ideas as to why
to it’s misfiring?
Bad O2 sensor combined with dirty/defective injectors, or maybe damaged head gasket.
Cylinders 1 and 3 are next to each other so a head gasket blown between the two cylinders is possible. Compression test cylinders 1 and 3 to be sure. If your readings are very low or zero on those two cylinders the head gasket is blown. Hope that helps! Jim