Squeaks and chirps

[Robert Conkey]

My 1987 4KCSQ has developed a unusual squeak/chirping noise from the engine compartment.  The noise has the following properties:

It's getting progressively louder
It only occurs under trailing throttle
It stops immediately when the clutch is depressed
It's frequency is proportional to engine speed not road speed
It won't occur at idle or when the car is stopped which makes it hard to find.

Has anybody had this happen to them or have any suggestions?
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