Intermittently, when trying to accelerate from a stop; or a near stop, the vehicle does nothing for a second or so. The vehicle also vibrates at various speeds while the hybrid system is engaged. It is dangerous and a safety concern because you can’t merge correctly or go through an intersection, without wondering if someone is going to broadside you, as you wait for the car to make up its computer mind to go forward. (accelerate.) And the vibration as previously mentioned. The problems cannot be reproduced by the dealership. No inspection other than the dealership, and no warning lights, etc. The car is available for a detailed inspection if needed. I first noticed the issue around approximately 7000 miles and brought it to the dealership for both issues. I’m repeatedly told excuses: it’s my rims, a balancing issue, or I don’t understand how a hybrid works, etc. I told them I know a car is supposed to go forward upon accelerating, regardless of the power plant: gas, electric or hybrid; and that a car should not randomly start vibrating at various speeds when the hybrid system is engaged. I notified KIA America and have had it to the dealership three times for both issues. I get we’re sorry notifications, and to call about concerns with no help. I have found complaints online for the same issues involving the very same vehicle. I cannot understand how there is no technical service bulletin or recall on this vehicle. Thank you, [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)