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  1. 2020 Mustang GT ESS G3 w/ intermittent rough idle/stalling, drives perfectly – extensive diagnostics already performed

    Struggles of getting an already modified and boosted GT... I am making this post due to trying everything I know of to try. I'm at the point of believing it needs a new tune. Which is $1,300 with Wengerd Performance. I am trying to cross every t and dot every i prior to spending that money...





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