I've got an '11 250AWD, 48K on the clock CPO purchase. Only had it for a month.

It's been pretty hot around here and I've noticed randomly the car starts up with a less than smooth idle. This ONLY happens if I've been driving the car, stop and restart it about 10-15 minutes later. A quick on/off/on does not produce any problems.

Outside temps are 80f+

No CEL has appeared so I figure a dealer visit is worthless. Am I correct in assume the intake temps are just so high the ECU has trouble calibrating? I'd gather intake temps are approaching 150-180 degrees based on my past experience with modifying/tuning cars, though I'm not logging anything on this stock car. Of course this goes away quickly.

My only other thought is this is carbon build up.

 

The car should not have any issues started back up when warm/hot. Do you have a healthy battery and good cables going to it?

 

You could try disconnecting the battery for 10 minutes to reset the ECU.

 

Yes, all stock.