Please tell me where I can find the "Diagnostic System Checks" codes for z28

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Car stopped running,not electrical,changed fuel pump & filter, startd and ran for 15+ min (ran fine)., ran a test run..1-1/2 miles car cut off...restarted car drove back 1-1/2 mi. Now car will start but then cut off. Back to square one. SCanners says Must check Diag. systems check for check engine light. Owners manual unobtainable at this point. Please help...thank you.