Hesitation

This sounds like a classic fuel issue. However, it may be ignition related but let's start with fuel.

Here is a guide on this specific issue that will get us started with what needs to happen and why it is happening:

https://www.2carpros.com/articles/engine-hesitates

To start, let's check the fuel pressure when this is happening. Here is a guide that will help with this:

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

Once we know if the fuel pressure is ok, then we can take the next steps. However, assuming it is ok, the next things is a vacuum leak and then a misfire. Here is info on both of these issues:

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

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

A lot of times a misfire will not present itself until it is under load so we can also check for codes and find out if this is there as well.

Here is a guide that will help with this:

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

Basically we have a lot of info to go through on all of this. So if it is fuel, then we can stop with the pressure but if not, let's just keep going and let us know what you find with each of these. Even if they all check out then that is good info that we will need to solve this.

Please let us know what questions you have.

Thanks