Had the same problem last year 2007. Took it to the dealer with the code P1494 Emission problem. The dealer stated it was a bogus code and replaced the computer under the federal emissions warranty and now it is back again. I have to take it in again and I am sure they are gonna love me since I have already been there and did that. Someone said it might be a vacuum hose or the dealer said it was some type of Y connector hose and ended up charging me about 60.00 bucks last year after they could not find anything else wrong once they replaced the computer and the engine light came again.. Here I go again.