Q: Q: losing acceleration

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My husband's 2009 GMC Acadia is stalling and loses acceleration when he drives anything over 45 or 50 mph. He got the codes read which indicated he needed a tune up which has been done (replaced the spark plugs ect..) and still continues, any idea what it could be? Fuel filter or fuel pump ?

My car has 120000 miles.
My car has an automatic transmission.

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