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RPM in 2009 Sonata 6

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Old 07-26-2010 | 04:22 PM
howard264's Avatar
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Default RPM in 2009 Sonata 6
Bought a Sonata LTD 6 w. 13000 miles, now 23000 miles. When starting car in morning (or after 5 or 6 hours) rpm jumps to 1500, drops to 500, jumps to 1400, drops to 500 and so on for five minutes or so until it smoothes out at 650 or so. Obviously this is not proper. Any ideas on cause, cure?
 
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