need help on 93 100S

[Seung O <qwe@wam.umd.edu>]

HELP! My house guest washed my car today. As I was mowing the lawn I 
spotted him hosing water into the exhaust pipe, I was like, "What are you 
doing?!" And he told me that he does it all the time to his Mercedes 320 
to clean the exhaust pipe. So I let that slide and I continued to mow the 
lawn. And when I finished I saw him hosing down the engine. My concern is 
I have the K&N cone shaped filter charger and it got water into it.

Tonight as I was driving the car around town, I noticed the car idles 
rougher and is really really hesistant! Did he screw up my car? Would 
hosing down the engine and the exhaust do that to a car? She ran so 
smoothly and quietly until this happened! What to do? Do I have to kill 
this guy or what?

Any help would be appreciated!

Seung Lee
93 100S
somewhere boring in Md