Q: Lumina APV 3.8 "code 56 quad driver module" engine does not run is unstable on 1992 Chevrolet Lumina APV

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Greetings I have a Lumina APV mini vans 1992 3.8 engine my problem is I do not have strength to run and minimum is very unstable and vibrates much put a wire on terminals "B" and "A" connector obd1 appears fault code 56 "quad driver module". I can do
(1) Answer
possible ecm failure. quad driver is in the ecm. make sure it is the failure before commiting to a repair