Q: 2014 Prius 2 transition electric to gas is not smooth while driving

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All of the sudden the transition from electric to gas is not smooth (loud, shakes). Has persisted for the past 5 days.

My car has 47000 miles.
My car has an automatic transmission.

I would initially suspect an engine fault (or even something as mundane as bad gasoline; did the incident perhaps start after re-fueling?). There are some technical service bulletins relative to your model describing rough engine operation that was due to EGR system malfunctions but also related to the design of the intake manifold. In instances of customer complaint, a redesigned intake manifold was installed. There have also been software updates. What you are describing may relate to simply rough engine operation but such could be intake, fuel, and/or ignition related. What I would suggest is have this diagnosed as rough operation and the responding certified mechanic will perform the required diagnostic steps to get this resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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