spark plug plugs removal

Hello, this is my 1st season with my 2005 290 Amberjack. I’m getting what I think is horrible fuel economy. So I’m going to change the fuel filters, spark plugs, cap and rotor as my initial “tune up”. I have twin 5.0s Mpi merceuisers. Anyone have any advice for changing the plugs. The engine...

Searay gurus, I have a year 2000 260 DA (single 5.7 EFI). It has Sierra brand manifolds and risers. I'm attempting to replace the spark plugs and am having some issues. The clearance between the plug and manifold is so close it doesn't allow use of a typical 5/8 plug socket. Is there a trick...

I recently had my oil changed. After each oil change I send a sample to Blackstone labs. I just got the report and for my port engine the report states: 'Copper has increased considerably, while other wear metals held pretty steady in relation to what we saw from this engine in 2009. This amount...