Always nice, just get a cheap bluetooth elm 327 OBDII and the free Torque APP.
I have the same problem with mine Trax, it happens to me when up to 1000 rpm, but when I turn it off and on again it calms down to 900 rpm and everything is normal.
I live in Minnesota and I have the same problem and when I did take my car into the dealership they said they couldn't find anything wrong and I asked them is it normal for the inside of my cabin to smell like exhaust and they told me that it was normal. Well last night I started my car using the auto start and I could hear my car sputter so I quick threw on my coat so I can see what was going on and I noticed that inside my cabin it was filled with white exhaust fumes and bluish white fumes coming out of my exhaust pipe this isn't normal as it was explained to me . This happens whenever the temperature drops .I did purchase an extended warranty .