I got a 2001 monte ss with about 125,000 miles on it. Sometimes when I pull up to a complete stop at a stoplight the idle rev drops low and it seems like the car is about to stall. I usually gently apply the gas and its all good after that. Any ideas on whats causing this problem?

 

could be numerous things, let's start with the most likely. MAF Sensor / IAC Valve.