Idle speed increases as engine warms up HELP

[Uncamitzi]

I did a search for this and became very frustrated. I know that I've see this talked about and answered but when I do a search for it entire threads that just mention idle, speed, fast, come up... I'm hoping that I can spend some time looking for the problem on Friday before I leave for Reading.

The car starts with a normal (about 500-650+rpm) idle. as soon as the temp comes up the the idle slides up to about 1500 + way too fast!!!!

I'm guessing a vacuum leak... and I do hear a whistle when the gas is pressed down.

Any leads? any guesses?

this is killing my mpg... in the city(5-12) ... Highway mpg is still about (26-30)...