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Mike,
I, too, have had this problem. In addition, at the 17,000 to flight level 200 altitudes, bootstrapping was a huge issue.
I started with a turbo overhaul...something big had evidently gone through the intake at some point, breaking several fins.
That greatly helped my lower altitude engine characteristics...allowing lower RPMs (read quieter) with same (about 65%) settings.
But...I still had the bootstrapping at the low flight levels.
My A&P just sent the exhaust system off for work, with numerous leaks found. Theoretically, that should fix the problem. I'll be able to let you know if that does prove to be the solution in reality next week, after I get my bird back and fly to SBS and then OSH.
Good luck.
Kimber
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Kimber Eubanks
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