2001 Escort ZX2 L4 DOHC
109,000 miles

I noticed the service engine soon light come on today. The engine runs a little rough at idle, but normal while driving. I also can hear air coming from the engine when it's running and even for a second or two after I turn off the engine.

I hope this is something minor, but any ideas would be greatly appreciated!

Thanks all

First step it to figure out what trouble code(s) are in the computer. If you can hear a vacuum leak than I would bet that it is a lean code. There is a vacuum elbow that deteriorates frequently. it connects to the intake right below where the throttle body sits.