so this must be a very common problem lol

 

it's the old squeak from under the hood hunt. i went through the same thing back when i had mine. changed both idler and tensionor pullies along with new belt, still no fix. ended up being the synchronizor shaft. if you are unfamiliar with it, look near the firewall on the intake, where the distributor would normally be(it takes the place of it). the shaft will run about $75 if i remember correctly. you will need an alignment tool and have #1 cylinder TDC. just like replacing a distributor. hope this helps. let us know what you find.

 

but did urs squeek faster when u pressed on the gas and then disappear and when u get bak to idle it comes back?

 

it did exactly that, it still squeaked at speed but it was doing it so fast that i was very faint. you could always do a redneck diognostic, take a cut off broom stick and place it near the synchro shaft while it's running, place your ear on the other end and if you hear it through the broom stick that's the prob. like everyone else said though, i would try either the idler or tensionor pulley first.

 

alright i'll do just that