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Slight thud when idle drops

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Old Nov 3, 2018 | 05:23 PM
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Slight thud when idle drops

2005 Expedition 4x4

When I'm idling in gear stopped, if I tap the gas a tiny bit say up to 1200 rpm's, I feel a slight thud as the rpm's goes back down to idle. It's like when you put it in gear, but this is already in gear, coming back down to idle. Any suggestions?
 
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Old Nov 4, 2018 | 09:28 AM
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Check the engine and tranny mounts for wear or breakage.
 
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