Engine misfire?

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Bams

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Hey all, left my expy at my parents for a simple fix and they let it sit for two months, apparently didn't touch it once. Now it seems like the engine is misfiring? The service engine soon light is on, and it flashes over 1500 rpm or 30 mph. I have 0 power, especially uphill, and it stalls in reverse. Engine shakes the whole car at 40 mph or greater than 1/4 throttle. Is this a misfire or could it be something else?
 

ManUpOrShutUp

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Second the request for codes. Also, why were your parents obligated to fix your Expedition?
 
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