Hi,
Have you checked for diagnostic trouble codes? Also, have you checked for engine vacuum leaks and fuel pump pressure?
First, here is a quick video showing how to scan the vehicle:
https://youtu.be/InIlnsjOVFA
I realize most people don't own a scanner, but oftentimes a parts store will lend or rent one to you.
Next, make sure the fuel pressure isn't too high or too low. Here is a link that shows in general how to check fuel pressure:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here is a link to help locate an engine vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
I don't know what all has been checked so far. Sitting here, I'm even questioning if a catalytic converter could be plugged. Take a look through this link and let me know if it mirrors what you are experiencing:
https://www.2carpros.com/articles/bad-catalytic-converter-symptoms
Let me know what all has been checked. If the things above haven't, that is where I would start.
Take care,
Joe
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Saturday, May 8th, 2021 AT 9:32 PM