I just bought a 2003 pontiac vibe GT with 250000kms. What I am noticing is that the car idles anywhere from 1.6 to 2.1 rpms with it usually hovering aroun 1.8-2.o rpms. This happens at startup but also when the car is warm. I notice my air system seems to affect it but sometimes turning the air on makes the rpms drop and sometimes it makes them increase.Any ideas?