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I have a 1998 chevy silverado z/71 4x4.
I had a water leak and had the intake manifold gaskets replaced. Ever since then, the check engine light comes on and it soots up the o2 sensors and the 4 plugs on the right bank. It may run good for a month or so and then it starts all over again.

And you continue to accept this a “normal.”


Take it back to whoever replaced the intake manifold gaskets and ask them to correct their work.