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09 Sierra 5.3 no start HELP


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Hi, i installed a cold air intake on my 09 Sierra with 5.3. And the directions recommended unplugging negative battery cable to reset ecu, which i did, but did not specify procedure after doing so, and i am unsure what to do. I hooked the battery back up after an hour or so and to start and nothing happened. You turn key to start and nothing happens, radio works, but power locks do not. Please help, thank you

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