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RPM's go high low and high low when stoping at a signal

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Old Dec 10, 2013 | 11:06 PM
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surferjoegomango57's Avatar
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Default RPM's go high low and high low when stoping at a signal

2005 f-150 4.6L auto
When I begin to stop at a stop sign the rpms fluctuate high(900) to low (400)
back and forth until it equals out at about around 600 or so. Don't have a rough idle, not perfect but smooth. 190000 miles. Thanks in advance.
 
Old Dec 11, 2013 | 02:22 PM
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If possible, have someone check out the charging system.
 
Old Dec 11, 2013 | 02:32 PM
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Thanks Hank
 
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