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You can test the fuel pressure regulator by attaching a hose to it and sucking. It should hold vacuum. If it doesn't it will run rich. OBD2 started in 1996 so you may or may not have it.
Passkey aka VATS (vehicle antitheft system) turns off the fuel if you are not using the right ignition key. It was first used in the S10 Blazer 1996 General Motors Vehicles Equipped with PASSLock. There will be a security warning light near the speedo.
 
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