XJ swallowed a slide-whistle?

The last few times I have driven my '92 XJ I have noticed that as I let off the gas I will here a slight whistle sound. It kind of sounds like a kids slide whistle.. you know weeeeooooooppp. Any ideas?

Reply to
aGraham
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aGraham did pass the time by typing:

Dirty throttle body butterfly or bore. A little ridge of crud is all it takes to get those singing.

Reply to
DougW

Reply to
L.W.( ßill ) Hughes III

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