Hello,
There are few reason you can experience surging.
It could be due to fuel starvation, spark issues, can also be for vacuum leaks.
First inspect under the hood for any vacuum leaks, look for cracked or loose hose. Check the air intake tubing and make sure it is connected properly.
You also want to check the spark plugs. If they have excessive carbon buildup, it is time to change them.
Also the fuel filter needs to be checked. If there is a clog in the fuel filter you can experience this type of issues.
The fuel filter is located near the firewall - driver side, under the master cylinder.
Here is a helpful article that goes over the basics cause of surging:
https://www.2carpros.com/articles/engine-surges
Please let me know of any questions.
Thank you.
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Sunday, September 19th, 2021 AT 1:15 PM