Plus Engine

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My car loses power for a few seconds before changing the gear?! ....?

My car is 2005 RAV4. My car started to have some situations when I press on accelerator. My car is automatic. The problem is not obvious when I drive low speed like 30-50 miles. But when the speed is over 60 miles, It will lose power for a few seconds before changing gear. Then suddenly I can feel the change as the car jumps a little bit. Plus engine light is lit now. Is it an engine problem or transmission?
I had my 90,000 miles maintenance two weeks ago.That guy charged me $ 1,200 for the service. I want to know what could have happened to my car before bring it back to the garage.

Difficulties when attempting to shift is the transmission. May need a new torque converter.

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