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2003 Malibu wake setter loss of power

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2003 Malibu wake setter 23 xti

335 monsoon engine

just wondering if anybody has run into this issue

it seems like more so when it’s cold. But at multiple speeds, it will surge from getting power to bogging in a way  I replaced a fuel filter and fuel pump and I disconnected the perfect pass and messed with the throttle still no change. Once it’s warmed up, and we cruise 20-30mph for 15 minutes or so it runs good and then it randomly falls on its face and loses power and then comes back again.  I checked the throttle position sensor connector etc. wiring grounds, etc. just wondering if anybody has some insight

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When was the last tune up (plugs, cap, rotor, wires)?

Have you checked the fuel pressure?

Have you ever changed the fuel lines?

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