@Melonlity -- good point and a leaking intake gasket is downright annoying and a lot of trouble to fix because removing an intake manifold is a fairly time consuming procedure. You can, by the way, often detect a leaking intake gasket as you will hear a clicking sound under the hood due to air escaping.
But, it's important not to confuse that gasket with another one. A good test is to use water on any suspect gaskets and watch to see if bubble forms when the engine is running. If so, you've got a gasket that needs to be replaced.
That process was a lot easier in the old days when engines weren't so complicated and covered with components. The difficulty of getting to gaskets to even test them underscores the original point -- take the time to do the gasket work right or you will regret it later.