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I'm not very familiar with that model, but what is the idle RPM supposed to be? You said that it smoothes out at 1000, if I remember correctly isn't idle speed about 900 on that model? My Volvo MD31A (62hp) shakes and vibrates when it first starts and is below normal idle speed and then smoothes out. You should contact Volvo and get the idle setting, then check the RPM at the engine with a handheld tach, don't believe your tachometer until you verify that it's correct. It may just be that your idle is set too low. I had a Yanmar three cylinder that would shake pretty violently at low RPM when cold, but was fine after running for a minute or so.
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John
SV Laurie Anne
1988 Brewer 40 Pilothouse
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