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Why 4K rpm? Did it shift? Did it shift when you let up on the throttle? With the tachometer fluctuations it could be a misfire. Check the easy stuff. Mouse nest in air box? Spark plugs‘ condition, gap, color. Fuel fresh, water contamination? 2012 with 70K miles it could be suffering from many conditions associated with long term storage.
 
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If it acts normally under normal acceleration then the foot feed thingy that sends the signal to the ‘puter might be bad. When you mash it your getting into a bad spot on the foot feed sending unit. Try accelerating normally and then when above 60mph mash it to the floor.
 

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Did you try my suggestion of accelerating normally and the mashing it to see if the foot feed sending unit was faulty?
 
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