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Could be a transmission problem or something as simple as bad spark plugs. The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts. You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test. If the spark plugs have more than 50,000 miles of wear you might start with replacing them.
You'll need to have someone scan the computer for the codes. Most auto parts stores will scan for free in hopes of selling you some parts. Once you get the codes you can research them online or in this question.
It sounds like there is a problem with the Idle Air Control (IAC) valve. Its job is to open and let air into the manifold when the throttle is closed at idle. If it does not open, the engine dies at idle. The IAC is mounted on the throttle body. Possibly the valve is clogged or stuck, in which case it could be ok again if it is removed and cleaned. Or it is broken, and needs to be replaced. Or, there is a problem with its electrical connection, that needs to be traced. Good luck, let me know if you have any questions.