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Q: Why does the reduced power light flash when I try to start my vehicle in the morning after sitting overnight?

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Why does does the engine reduced power light flash when I try to crank my vehicle in the morning time..after sitting overnight..and drives like it's stalling..if it sit running for more than 5 mins? I was thinking it's the spark plugs and wiring...need changing..PLEASE HELP:-(

My car has 169759 miles.
My car has an automatic transmission.

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