Q: Q: truck

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hey so i have 06 f15 my alternator just got replaces and my alternator belt. but as soon as that was done my check engine light went on and now every time i drive my rpms go up to like 5 or 6 and my rear tires start to tick at like 70 mph. Please help me

My car has 140000 miles.
My car has an automatic transmission.

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