350 mag rumbling

dan313

Active Member
Sep 27, 2009
246
Long Island
Boat Info
2005 270 Amberjack
Engines
350 Mag Bravo3
I was out fishing and after starting the motor a few times i noticed a rumble in the motor at the low end 1000rpm-2000rpms. The boat shook and it felt like the motor was missing. When i went above 2000rpms the rumble went away and the motor ran smooth. Also on two attempts to start it did not want to start. I had to crank it 3 times before it would start.

I changed the plugs this afternoon. One plug was a little wet ( not water) and the others were gray.

Any help would be appericated.
 
Are you sure you didn't mix up your plug wires?? A simple mistake and can cause some funky issues. Just a thought
 

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