misfire?

There are a couple of things that could cause this.

This could be a misfire, or it could be a vacuum leak. So, we need to start with a vacuum leak and find out if we have anything with this and go from there.

Here is a guide that will get us started:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If there are no vacuum leaks, then we need to move onto a misfire. Here is the info on this so that we can start crossing these things off the list:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

We also need to check the fuel pressure and find out what is there when this is happening.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Weak pressure will cause exactly what you are seeing.

Lastly, we will need to check for codes. You may want to start with this but if there is no light on then there may not be any codes, but we should check.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let us know what you find with all this info, and we can go from there.

Thanks