ACCELERATION PROBLEM

I would scan your Power Train Computer to see if your have any transmission codes, you may have a slipping or improperly engaging torque Converter Clutch which deploys at around this speed. If its deployment is not correct, you will feel what feels like a misfire or a hesitation. Do you have any Service Engine Soon/Check Engine Lights ? If so, by all means have those codes retrieved and inspected.

egr proble or throdel need to be clean