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How are the plugs and wires? Check the exhaust back pressure.
Unplug the o2 sensor and drive it,if it runs good after it gets warm you have a closed loop issue with the system.Sent from my LM-X420 using Tapatalk
Do you have datastream on a scan tool? What's the fuel integrator & block learn at? Have you checked for vacuum leaks?
Quote from: VileZambonie on June 13, 2021, 06:24:55 PMDo you have datastream on a scan tool? What's the fuel integrator & block learn at? Have you checked for vacuum leaks?Do these cables actually work?https://www.ebay.com/itm/GM-12-Pin-OBD1-to-16-Pin-OBD2-Convertor-Adapter-Cable-for-Diagnostic-Scanner-New-/401533946179