2001 Jeep Wrangler makes whistling sound except when you accelerate. Everytime you put your foot on the gas, it stops....take your foot off the gas and it whistles

If you have an aftermarket intake on the jeep the throttle body is making the whistle... there are many aftermarket throttle body spacers out there that can eliminate this...
if you dont than I think that we have the same problem... might be a vacuum leak if the jeep idles funny or it could be an exhaust manifold leak... I'll let you know if I figure out mine. :)

Bad ground, probably coming from the radio, most likely bad radio ground supressor...