No driveability issues otherwise? RPM drops smoothly when put into drive? Shifts fine? Throttle response? Will it idle smoothly and/or run normally if you manipulate the throttle/off idle? Did the CEL come on during the rough running event?
I'm betting a problem with the throttle actuator, but it could be an input or output from PCM. Unless it's had the battery disconnected, codes will still be in memory/storage in history, if not pending active codes as well depending on how frequently this happens. Did you take it to the dealer with this specific complaint or just because it had a CEL show? If the latter, that could be your problem, i don't know if a licensed guy did it or just one of the oil change guys. They could have just done a scan and seen no active codes and unplugged the scan tool.
It would be easiest to diagnose if this can be replicated every cold start. Give me a little more info. We'll get to the bottom of it.
At this point many things could cause this. EVAP purge solenoid, bad PCM, O2 sensor going out, coolant temp sensor bad. Being this problem is 90% an electrical or electronic problem, it doesn't matter how new the car is. It's really luck of the draw as to which cars get built with sensors/electronics that last forever (my 07 for example) and those that need to be replaced prematurely.
I'm betting a problem with the throttle actuator, but it could be an input or output from PCM. Unless it's had the battery disconnected, codes will still be in memory/storage in history, if not pending active codes as well depending on how frequently this happens. Did you take it to the dealer with this specific complaint or just because it had a CEL show? If the latter, that could be your problem, i don't know if a licensed guy did it or just one of the oil change guys. They could have just done a scan and seen no active codes and unplugged the scan tool.
It would be easiest to diagnose if this can be replicated every cold start. Give me a little more info. We'll get to the bottom of it.
At this point many things could cause this. EVAP purge solenoid, bad PCM, O2 sensor going out, coolant temp sensor bad. Being this problem is 90% an electrical or electronic problem, it doesn't matter how new the car is. It's really luck of the draw as to which cars get built with sensors/electronics that last forever (my 07 for example) and those that need to be replaced prematurely.