I have a 2011 Kia Forte SX with dual(-ish) transmission (shifting paddles on the wheel, and a slot by the shifter to move up or down gears). It currently has 62k miles on it, and was taken to a Jiffy Lube in November 2016 for routine maintenance.
The first time it had lurched was after accelerating from a complete stop. I went to accelerate in a typical manner, and it had lurched forward twice; the second time about half a second after the first. I had been driving for about 10 minutes at that point, the road was flat, weather was nice, no change in driving habits or route.
The second time I was moving at about 30MPH up a slight incline (freeway on-ramp) accelerating to the posted speed (60PMH) when I experienced the same behavior. It was a little bit wet at that point, but no change in my driving behavior.
The third time I was moving at about 40MPH up a steeper incline (going up a hill) and it lurched again.
It lurched twice each time, about half a second after the first lurch.
My car has an Eco boost mode on it, and is always on unless I've started shifting manually. Each time this has happened, the Eco mode would not turn on again. Typically, if I began shifting manually, after about a minute of no shifting being done, it would switch back to proper automatic, and Eco mode would be turned back on.
Some other symptoms I noticed were:
- If it happened once during a drive, it would happen more often during that drive.
- After it happened, the gas pedal was ineffective (pushing in the gas pedal did not result in acceleration, or an increase in RPM).
- Immediately after it lurches, the Eco light turns off, the check engine light then turns on and back off.
Restarting the car seems to solve it for a time.
I checked the oil shortly after the second incident and noticed that the oil was low. I haven't put in more yet, because I haven't had it say low so soon after an oil change (I got it changed at 61k, expecting another at 66k). I haven't noticed any oil leaks in the parking spots that I've left since then.
Any thoughts on what could be causing this behavior?