2015 Kia Optima Hybrid - Engine light will come on and then the HEV light will come on. When lights are on and you stop the car and then try to press gas car lags until you press the gas almost to the floor. It will then larch forward. It is in the shop right now and I had the same problem before and they changed out the transmission but I still have the problem. They had no idea what the problem was either they just changed the transmission because they were guessing.
Both are telling you that you have a problem. You need to tell us the trouble codes that are stored in the car causing these lights to shine or anything we say will be far less accurate than your dealer who didn’t fix the problem.
Find another dealer. This car, if not still under warranty, at least has a record of this complaint that was not resolved while it WAS under warranty. Take it in to another dealer.