for a few times i noticed that when i turn on the a/c and the rpm's drops to nearly 300,so i started troubleshooting the problem and everything was ok the vsv,vacum lines and the harness plug.all stuff was ok but the plug,there was no ground so take it apart and use a chassis ground for test.right away the rpm's started to go up but no such much so i turn the screw out a bit and it worked.a new problem rise and now the rpms wont come down even with the a/c off,but then i remember that the a/c button was wired to an aftermarket temp switch,dont know why but the a/c' wont turn off even if i turn it off with the button,so i figured out thats why the vsv always stays on,so i also take the + wire of the plug (cut from harness) and tap it with the a/c compressor to use the a/c cycles and now it drops when compressor is not in use or when cycling.now the engine gets 900 rpm's with out a/c on and slighty higher when a/c is on.
a/c now is working really good!

hope this help someone.