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run the fault codes first to check for faulty sensors
what you describe indicates a problem in the exhaust in that when the exhaust gas volume reaches a certain level the sensors are reporting it and the ECM is not able to fix it
have an accredited exhaust shop check the cat converter
for failure and partially blocking the exhaust at speed
if it was a fuel pump you would run into problems long before the speed at which it occurs
AT best it could be an EVAP problem with the vent not working properly but I think that it is exhaust related
You need to get the codes from the computer to know where to look. This could be a simple O2 Sensor and on this model vehicle the ECM will go into fail safe mode that will let you drive it to a service location for repair. The stored code will tell you which it is and what you need to look at for a repair.
You describe this as an acceleration problem however, if the car does throw a check engine light it should be recorded in system memory so it can be pulled by scanning with and OBDII scanner. It sounds as if the car is being starved for fuel on acceleration. Check the fuel lines for kinks as well as check the fuel pressure. The problem could be a faulty fuel pump that has yet to completely die.
AutoZone should have gotten more than 1 code for this problem. The problem could be any number of things from knock sensor to O2 sensors. More information is needed.
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