Hello. Have a 2021 F150, 3.5 Ecoboost, 3.55 axle. 24k miles. About 3k miles ago I started to notice a slight “stick” or bump when I initially accelerate. It feels like a lot of different things, like driveshaft loose (checked it’s not), wheel lug nuts loose (have retightened many times so good there). If I let off brake and start to coast then accelerate doesn’t happen. Or if I let off brake and very slowly accelerate doesn’t happen. Only when let off brake and press gas. It is very slight but feel it. Hasn’t gotten any worse. Have done many searches and can’t seem to find anyone who has experienced same. Computer has been reprogrammed a few times as I had the 8th gear shutter. Runs great after reprogram. Thanks in advance

 

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Can't be sure what you mean by "stick".
What is described sounds much like the following and would be a normal action.
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When letting off the Throttle at speeds above about 10 mph, the Program shuts down Fuel Injection as a fuel saving action since Fuel adding during that time, would only be waisted and cause additional Braking to slow the vehicle.
At this time, rear auto braking might also take place as a feature of the truck.
I see both of these working on my 2018 5L.
As you re-apply Throttle, fuel Injection is brough back to power the vehicle or comes back automatically at about 10 mph to keep engine from stalling.
What you might feel is a slight delay of Injection returning that feels like a Bump at times. Throttle open with no fuel = a little Bump at times as fuel returns a bit late.
This action can be seen with a Scanner hooked up to monitor the injection in real time to see it work.
A re-set of the Throttle Body might be of help in minimizing this action, if that is what you are sensing during a drive cycle.
Just a thought for what you may be feeling.
Good luck.
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Good info above! Something that came to mind is the old slip yoke in the drive shaft, does your layout have a 2 piece drive shaft? If it does that's a classic sign of the slip yoke sticking from dried out lube. As you brake the yoke slides one way( easily with no load) When you take off it has to move under load and will stick and be noticeable when it does. If you have a 1 piece drive shaft never mind about all that!

 

If you have Hold setting turned on, if you have that available on your truck, turn it off and see if it has changed.

 

yup I had my hill decent on and when I took my foot off the brake I had to give it a little gas, with it off I release the brake and truck rolls away some features are annoying but nice when you get used to them

 

It's the brake hold feature. Perfectly normal. Annoying but normal.

 

Most likely this. It can be turned off in the settings.

 

Interesting

 

Thank you all. I tried the brake hold feature initially and didn’t seem to make a difference but will definitely try resetting again. Thank you all for responses. Much appreciated!!

 

In some cases it may also be Hill Hold Assist (stops you from rolling backwards on a hill). That can also be disabled.