Check your carb to intake gasket. I had this happen on my 69' Cutlass no long ago. Whistling and sucking air through there.Problem solved (for me)
David
http://FirstGenFirebird.org/show/closeup.mv?CarID=571 If i don't get this car back on the road soon i'm gonna go postal! On a quest for FGF knowledge 1968 Pontiac Firebird Convertible 1969 Oldsmobile Cutlass "S" Convertible *Sold*