This isnt on a Sebring or Avenger but you might be able to help me anyway.  I did a Tune up on my cousins Van.  Its a 95 Grand Voyager LE with the 3.3 litre engine.  I replace the front set of plugs last weekend without any problems.  I didnt do the back cause i was gonna get a new upper intake manifold gasket so I can take the manifold/plenum off to make it easier.  After getting it all put back together, it runs ok, no misfires or sputtering but at idle, there is a whistle coming from under the hood & I cant find it anywhere.  Any ideas where is might be from?  Any help is greatly appreciated. 


Edit:  Yeah, i did do the back but I did it a few days later after the front.  Forgot to add that in there. 

Yeah, sounds like a vacuum leak.

That would sort of constitue a vacuum leak! 

u mean metallic valve divisional disfiguration?

given the engineers upon diagnosis of a prior concern did not interchange the initial manifold for one of nominal value. If so the the current problem would have been forseen and therefore compromised.