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Re: many codes missing bank 1
Getting a code for O2 sensor doesn't necessarily mean an O2 sensor. Sometimes it means 'look upstream'. As in, to the upper intake and surrounding sensors and components and vacuum. Could be a faulty EGR valve or IAC etc. Blazers are also notorious for fuel line leaks in the intake, they are in my 1993.
Multiple misfire, if you have new cap/rotor and wires, it could be a bad coil. Or suspect wiring.
I'd do the EGR first, used because new is $$, get a used one from a U-pullit or boneyard to try. Might make it run better.
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