Kyle, the most common symptom is coolant running down the rear of the intake, then an overheating issue, and then coolant in the oil and misfires. Be Sure the lower intake isn't leaking too.

It upper isn't a really hard job to do, the lower is a bit more work, you really need to be careful with the plastic elbows that go into the front of the intake. they get brittle and crack. The dealer carries them, as well as the aftermarket.