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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    All, thanks for the troubleshooting help with this. I confirmed the fuel pressure was ~9psi and ordered a regulator. It is arriving today, and I'll get it swapped on tonight. In other news... one comment and two observations after running this weekend... * I put in some seafoam carb cleaner...
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    I assume the gauge pressure is accurate. I can double check with a second gauge. If 9psi is too high, would a regulator be needed?
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    This morning I completed the following: * checked anti-siphon -> it appears clean * checked inlet to carburetor -> it appears to be clean * installed a fuel pressure gauge -> fuel pressure is ~8-9psig through RPM range * hooked up a vacuum gauge to the manifold ->vacuum is ~17-18 inHG
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    The gas is ~1/4 from last year (which had marine sta-bil in it) and 3/4 fresh gas from this year.
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    Roger that.
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    I'll hook a fuel pressure gauge on it tomorrow and see what I get. Is it 4-7 at any rpm/load or just idle?
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    Sorry about that. The videos should be fixed. It is a carb....4bbl Rochester. Engine serial is 0F010181.
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    1993 5.7 Mercruiser Low Power and Stumble at WOT

    All, I am having an issue with the Mercruiser 5.7 in my 1993 Regal 233 with the alpha 1 gen 2 sterndrive. I picked up the boat end of last season and didn't get much run time on it, but I had some issues with hard starts, low power, stumbling, and stalling. I checked the timing (8deg BTDC)...
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