help me fix my studder

[slowasss13]

ok so hear it isit fells like its cuting out from the time i let off the clutch to about 2500 rpms then cuts out from 3000 to 4000 rpms . the car also hunts at idel. im thinking its a maf problem? ( the car is a 90 s13 with red top on stock boost with sohc maf ,front mount, and 3 inch exhust from the turbo back) .if any one has any ideas plz let me nowhen i un plug my maf it runs fine so im thinking eather bad maf or unregistered air is geting in ......i am also hearing a wisaling coming from the back of the intake mani ..... so im thinking boost leek any one have any idea to test for vac leak at the mani gaskets?