This sounds like a possible bearing issue, suspension issue, or even a tire.
Basically when you are accelerating you are loading the drivetrain and taking up any slack or looseness in the suspension. Then when you decelerate the drivetrain and suspension relax and if they are loose they can cause a wonder. The feeling you are getting is actually the tire wondering back and forth down the road.
It is not going to be something that you will see until it gets to the point of falling off but we need to start with checking the tires and see if they are worn. This could be the issue or just a sign of what the issue is so here is a guide that will help with checking them
https://www.2carpros.com/articles/how-car-tires-work
Below is a chart as well. Please run through this info and let us know if you have questions on this and what you find with the tires. If they are fine, we should rotate them and retest just to be sure this is not a defect in the tire that is not visible. Then we are going to have to inspect the suspension. You should have a solid axle, correct?
Thanks
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Monday, August 16th, 2021 AT 8:32 AM