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A GOOD tune when loaded runs perfectly in minutes. A POOR tune needs hundreds of miles for the ecu to adjust unsuitable settings ie timing and fuel mixture. The ecu does this normally for changes in fuel and operating conditions but should not need to do it to a poor/dangerous tune.
On a second note if something goes wrong when installing the tune your ecu is toast! Not that it will happen but the more you change them the more complacent you become and the greater the chance.
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