Have a 2015 Infiniti QX50 Journey with about 50,000kms.
Noticed that sometimes when I start the engine (especially when cold) the RPMs will come up like a normal start, and then drop to below idle and the car will stall. Pressing the button again it will then start fine and the RPMs will stay high like it should with a cold start and then come down to normal idle when it warms up a bit.
Anyone seen this before? Maybe I should clean the MAF sensor (I assume there is one... haven't checked), check for any loose hoses (maybe a small air leak?), clean the throttle body (looks like they may get dirty quickly on these cars), change the air filter, etc... Haven't done much with this car other than oil changes since I bought it at 38,000kms.