Last summer we bought a 1997 160 HP Cessna 172-R. The test flight
(with 3 adults) went just fine.

Hi Chuck

Suggest you pull all of the plugs & examine them - I believe that you
will find at least some of them are black from running too rich.

I also suggest that you also post your question at:
http://www.cessnaowner.org/new/forum/forums.htm

There is a ton of Cessna knowledge there.

Tony


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Tony Roberts
PP-ASEL
VFR OTT
Night
Almost Instrument
Cessna 172H C-GICE