Idle issue/ Not wanting to start sometimes

Purchased this car new to me in February of 2011. Not long after purchasing I noticed that periodically when at a complete stop the idle would rev up, then go back down to normal. Since then I have been having problems with it starting. It acts like it is not getting fuel and I have to pump the gas to get it to turn over. There is also a smell like carbon monoxide for a few minutes once it finally starts. This is not happeneing at every start, but is becoming more frequent. Once we get past that she runs great, no issues while driving. There is a slight bump in the idle if I am stopped. Any advice would be great!