I researched this & you need to replace the throttle body gasket & get the throttle body re-calibrated. Seems to be dealer only. Also, the t.p.s. (throttle position sensor) could be bad.
It's on the throttle body, go to www.autozone.com for a description.
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Http://www.autozone.com/autozone/catalog/accessories/accessoriesShelf.jsp?categoryDisplayName=Performance&fromType=accessories&fromString=search&parentId=cat30102&filterByKeyWord=throtle+position+sensor¤tPage=1&navValue=100289&categoryNValue=100008&fromWhere=&subPartId=prod62110&itemId=prod62110&displayName=Throttle+Position+Sensor
This whole thing is the link for your throtle body sensor, found at autozone.com
P1545: Throttle Position Control Malfunction.
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where and what is the throttle position sensor .
This is the throtle body sensor, or position sensor.
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