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Ralph,
Before you spend hundreds or thousands trouble
shooting the engine, I'd urge you to confirm the tachometer readings.
1. The static rpm check should be in calm winds
or perhaps with the prop edge on to the wind.
2. Beg, borrow or buy an electronic, digital rpm checker (like
from your FBO) and re-check the rpm.
If it really is low, I've got to defer to the experts.
Good luck on this.
Ed Burkhead
http://edburkhead.com
ed -at-
edburkhead???.com (change
-at- to @ and remove "???")
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