Check engine timing, base and advance.
Remove fuel filter/ water separator and pour the contents into a glass jar, let it settle and look for signs of water. Water will go to the bottom and gas on top.
When was the engine last tuned?
An engine can rev pretty easy without load.
When it's out of the water will it rev in gear? Caution remove prop to help reduce chance of injury also you must run on muff hooked to a hose to provide cooling. Be careful as the hose may not provide enough water to run at higher rpms for long, also suction may cause hose to collapse.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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