Richard,
	Maybe the catalytic converter is ready to let go.  When mine went
bad it sounded like the element was rotating inside.

On Sat, 21 Sep 1996 10:09:54 -0500 hotch@netaxs.com (richard hotchkiss)
writes:
>Hi Guys,
>
>My 86 GL make a buzzing noise that I hear somewhaere near the engine 
>when I
>accelerate onto the highway or when I really give her some gas.  There 
>is
>no noticable performance problem.  It sounds like an insect buzzing 
>againt
>a window. I wonder if it's the fuel pump working hard or maybe the 
>sound of
>the fuel injector control (first time I've had FI).
>
>Any ideas would be appreciated.
>
>Thanks
>
>Hotch
>hotch@netaxs.com
>
>
>