a couple of things i would check
have you had your car in for the coilpack recall?
the other have you replaced the MAF, any check engine light?
your probably going to have to get the car scanned and see if it is having any trouble codes pop up. if you can get them and post them here and im sure we can help much better.
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Rest in peace rich, no one will ever forget you. fo' shizzle mate......fo' shizzle 
quicker than quick, faster than fast i am...wtf, im on fire AAAAAAACK
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