I recently retired my 2007 SX4 230 K Miles on it. Still running like a champ. I now have 2012 SX4 when I take off from a stop it will stutter if I let my rpm get to low. My 2007 would do that when I got 80k miles on the spark plugs. I changed the spark plugs on this 2012 but that did not completely fix the issue. What is the idle rpm on the 2012. It is setting at 500 rpm that seems a bit low.