If you had a leak in the intake system, it would do more than just make your car miss at idle.
My car had a leak in the intake manifold, and the car would barely idle.
It screwed up the operation of probably both the mass air sensor and the throttle actuator, and the idle oscillated up and down rapidly, as the computer tried to figure out the proper mixture of air and fuel.
The car was completely undriveable.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".