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Reply To: 2016 Suburban 5.3 rough idle

April 19, 2020 at 9:57 am #597475
Jkinser31
Participant

There are multiple issues that cause this. I’d take it back to the dealer and tell them to preform a AFIT test on the fuel system. These are known for leaky fuel injectiors or high pressure fuel pumps. Or a worn cam lobe ive seen that not t how any codes also. Ive replaced lots that weren’t throwing any codes or showing misfires in the misfire data that fixed the problem.

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