Hi,
If there was an issue with a valve, it would likely set a misfire code.
Also, when you reach 30 MPH, are the engine RPMs in line with the speed? For example, at 30 MPH, are the RPMs around 2,000, or are they extremely high? Is the transmission shifting?
Have you checked fuel pressure?
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Let me know. Also, if you could record it and upload it so I can hear what it is doing, it may help.
Take care,
Joe
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Tuesday, September 20th, 2022 AT 9:08 PM