Question about 2003 GMC Sierra 1500

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I washed the engine and when i started it the engine light came on and ihe display said reduced engine speed and starts running ruff and then dies but it will restart after a while it ran good before the washing 5.3 L

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Sounds like you created a potential short when you washed the engine. one of your sensors may be tempoarily shorted. I would wait for the water to dry out and see if the problem is still there. if the check engine light came on you could have the codes pulled by autozone or advance autoparts

Posted on Apr 26, 2010

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