Whining sound in Blazer

95 s10 blazer (new body) with about 100k miles on it.
Got this whining sound when i press the accelerator. Appears bouth when driving and when standing still.
The alternator has been replaced with a new unit. The engine has also been replaced on warranty a year ago.
What should I look at and how to determine whats causing the sound?
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Start leaving the wife home?

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