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Have you checked compression on more than one cyclinder? I once broke a camshaft on an old truck and it died instantly. Things looked normal at two of the cylinders but not on the others.
these cars are known for bad wiring and failing sensors and controls. Unless you plan on pulling your hair out changing parts and chasing wires that may be bad or not, consider having a certified GM mechanic work on the car. Especially if it's a v6, this is not a good DIY car to learn on.
idl air control (IAC),may be bad,also,check the EGR valve,and all vacuum lines going and coming from the throttle body. yu can test the EGR,just try pushing the diaphram by hand from beneath. if you can move it easily its good,if its hard,or doesnt move,ot needs repaced. also a pcv valve and air filter are good ideas,considering you have replaced 80% of the emission system already.
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