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  1. Vortec 5300 5.3L V8
    I have a 2008 5.3 Chevy Silverado flex fuel has a code po300 and check engine light only blinks when it’s in park and when it’s put into a gear the Rpms drop low and the whole truck will shake and rpms will bounce up and down but the truck doesn’t act like it has any loss in power just doesn’t...
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