Thank you for responding, I do not feel any vacuum coming from it. I'm just reaching trying to figure out what is going on. The car is progressively getting worse it tops out about 40 mph and stutters and jerks the whole time while accelerating. I hooked a vacuum gauge up to it and it was pretty steady at about 20. The other day I took it to the mechanic and he said the fuel filter was pretty bad so he put a new one on and also replaced a cracked hose but it still didn't fix the problem.The hole looks like it's just the bottom end of the hole for the bolt shown above. When the engine is operating, do you feel any vacuum at the hole when you put your finger over it?
To check the intake system for a vacuum leak, attach a vacuum gauge to a full vacuum source. With the engine fully warmed up, the reading at idle should be 18 - 20 InHg. At 3,000 RPM, it should be around 21 InHg. If readings are under 18 InHg, check the intake manifold nuts to make sure they are tight. The gasket may have failed; spray a water mist at the gasket to see if the gauge reading changes. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.