Hi, first i'd check the computer for codes, and also check the fuel pressure. You Stated That This car Has 136,000 miles on it? And It's a 09. If that is Correct, then you need to replace the plugs and Ignition Wires (if They Have Ignition Wires) or the boots on the Coil Over Plugs, and Filters, etc, first.
Hope This Helps You,
Good Luck
Edward S.
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Sunday, August 15th, 2010 AT 6:32 PM