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Question edited for clarity.
Question moved to model category.
Unlikely to be vacuum lines as they throw codes and cause the Engine Malfunction Light to be lit.
You need a local auto electrician with a pro grade scan tool computer to diagnose the ECM, Powertrain Control Module, plus all the modules, sensors and the computer communication network between them all. It can even record what happens when you get to a hill and play it back!
First of all change the fuel filter. If that doesn't get it, change the spark plugs. If that doesn't help, check for vacuum leaks. Check all intake bolts for tightness. With the engine running, use a stethoscope, or a length of fuel line held to your ear and listen for a hissing sound. Wiggle all your hoses around and check for loose ones or cracked ones.
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