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1986 Chris Craft with Mercruiser 454's

aero2209

New member
My starboard engine starts and runs fine when cold. After about 30 minutes the tach
starts slowly dropping and then engine drops back to about 600 rpm and will not
accelerate. I have tried switching fuel tanks, replacing fuel lines, carb and fuel pump.
Also tuned engine with plugs, plug wires, dist cap, rotor and internal module. Switch
electronic ignition module with other engine. Checked compression and have 123-126
on all cylinders. Replaced batteries and have 13.5 to 14.4 volts everywhere. Tried
spraying WD40 around intake. Also replaced coil with OEM new. Just can't seem
to track this down. Any ideas??
 
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