Welcome to 2CarPros.
Anytime there is a power loss as you described, my first suspect is a plugged catalytic converter. At times, the internal portion of the converter can come loose and rattle, so I'm wondering if that is what you are hearing.
Do me a favor, take a look through these links and let me know if you feel the symptoms seem to mirror what you read. Also, if possible, record the sound you are hearing and upload it for me to hear.
Another idea is to take a rubber mallet and tap on the exhaust to see if you hear a rattling coming from the converter.
https://www.2carpros.com/articles/bad-catalytic-converter-symptoms
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Let me know what you find. Also, if you could let me know if the check engine light is staying on with the engine running, it will be helpful.
Take care,
Joe
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Sunday, November 3rd, 2019 AT 7:37 PM