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  1. 6

    350 mag idle vibration

    Compression test was done by marina, said all cylinders were within spec. But the engine was run all season before service happened in mid July. Fuel pressure to rails was good, spark plugs were supposedly changed, including new dist. Cap and new coil. Plug wires were changed within the last 2-3...
  2. 6

    350 mag idle vibration

    Ok will do that in next few days. I am wondering if they screwed up the engine alignment when they replaced the rear coupler and motor mounts. Not sure if that would manifest only at low/idle rpms like i am getting or the whole power band.
  3. 6

    350 mag idle vibration

    I just had an engine out service to replace a leaking oil pan. Years of neglect also requred new rear coupling, engine mounts, starter, and valve covers. Ignition coil, rotor cap, spark plugs and other bits went into the service. Before getting the boat back from the marina, they told me the...
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