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Hello Flip, have you checked fuel pressure yet? Also, have you checked for engine codes yet? Thanks.
You need a fuel pressure gauge to check it, was the check engine light on when you were driving it and it started acting up? Did you see it come on at all?
Alright, if it's pegged when it's cold, that's likely not it, If you don't have a fuel pressure gauge, You can borrow one from an auto parts store, and there is a schrader valve on the fuel rail, screw the gauge into it, and see if it drops below 30 psi or so when it starts acting up. it sounds like fuel pressure to me if it doesn't have any codes in it. Which would mean the pump is suspect in the tank, or the filter is partially clogged. Anything else that would cause that, would likely set the check engine light and give you a code. So if it doesn't have a code, I'm leaning towards fuel pressure. If you can check codes and fuel pressure and let me know what you've got there, that will point us in the right direction.
Sounds good, check codes as well, vacuum leak should set one. Make sure hose from mass air flow sensor to throttle body is in good shape with no visible cracks anywhere as well.