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Took my car for a thorough body check today and found the third injector to be quite dirty with water stain and took out some gas to see the quality which turned out to be black color almost. So the guys at the workshop reckon it's the bad gas causing the unstable rpm. So it's possible that Cobb has a higher gas quality requirement and it's more sensitive to bad gas that's when I stalled a few times while running their maps.
So conclusion is to find a better gas station offering cleaner gas which can be difficult in shanghai
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