I have a 99 Toyota 4Runner sr5 4WD and it feel like bumped well I am driving but if I Increase my speed it stops

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Daniel1993
Daniel1993

What could be Causing in this it is a 1999 Toyota 4Runner sr5 4WD and as I drive it feels like someone in bumping me from behind but no is. this start happening at about 49 to 50 and will stop when I accelerate. 4Runner has about 212500 miles on it

Techsus
Techsus

No idea what you're asking.