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Old 02-26-2017, 11:54 PM   #3 (permalink)
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sounds like they were just throwing parts at it instead of diagnosing it. Did you ever get this resolved? If not I would try cleaning the maf, throttle body and iac to see if that resolves it. Rough idles and miss fires can also be caused by vacuum leaks, bad injectors, bad plugs and wires. Start with the basics such as those and see if that doesn't lead you to your issue. There is tons of information on the internet on how to find vacuum leaks test for bad injectors and properly diagnose just about any issue on a vehicle. Hope this helps good luck! Also I believe timing being off can cause a rough idle these i know you had the chain replaced but was the engine put back into time properly? The check engine light is your first place to start. Remember your Nox is just a distant electronic cousin of your suburban. All the same concepts just with electronics thrown in.
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