A Buddy of mine did this with his 02 LS and now its Idling really high. I gave him my old factory tube and its still doing it, it sticks at about 2 grand and the slowly "sometimes" falls back down to around 1300-1500 grand.
We cant get it to stop, we disconnected the battery after a while and even messed with the sensors to see if that made any difference with it at all but it just keeps doing it. Another odd thing is that his airbag light keeps flashing..???????