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I had similar problems with my twin 454's. After much screwing around, I installed new plug wires and it made all the difference in the world. I also had new plugs installed, tuned them up and have been enjoying great boating for 3 years.hello boaters
I have 2 7.4 454 Mercruiser big block
at idle looks and sound good
then when in gear up to 1500 rpm no issues then anything over no power at all
need assistance if anyone experienced same issue
thank you
injectioncarb or injected?
than you SteveA 400DB is a big heavy boat for gas motors. Describe sluggish. What is your cruise speed @ what RPM.
than you Steve
I don't use the boat a lot
I just like to stay at the marina and chill
the fuel is old but looks good after test
on idle both engines sound good even at 2400 rpm no problem
when I take the boat out ,it runs good at around 1200 rpm then when I push on throttles and reach little over 1500 then both engine kind choking with no power what so ever to plain .
few month ago I reached 4500 rpm with good speed
thx again