Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
You really need a scan tool to diagnose to check fuel trims, you may have a vacuum leak that is causing your problem. It could be intake gaskets or a cracked vacuum hose. Spray the engine intake and vacuum hoses with throttle cleaner and listen for a change in rpm. This indicates a vacuum leak. A scan tool that can read live data would be helpful to check fuel trims at idle. I have also seen stuck egr valves cause this problem.
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