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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.One very common cause for the type of problem you are having can be caused by a sticking canister purge valve. I have enclosed the steps in the link below to test if in fact that is the case. Copy and paste the link to your browser to open and view it.https://dl.dropboxusercontent.com/u/104923897/Purge%20valve%20Dec%2023.pdf