Sounds like an over-rich situation. If you leaned and it cleared up
(some) then you might be too rich. The hot day could give you a DA
higher than your used to having.

--- In, rjf <rjf@...> wrote:
> There I was, in the cockpit of my Sierra. I fired her up and
> her out to do the run up. As part of my run up, I always pull the
> throttle to idle. I want to know in advance what my mouse is going
> do when I pull the throttle to idle during landing. She idled
> and it seemed unusual.
> The temp was somewhere in the upper 80's. I had the mix full
rich. If
> I remember right,the tach was wavering between 500 and 600 rpm. I
> couldn't hear an obvious misfire or anything like that. When I'd
> during idle, it seemed to run a little better, and I got another
> rpm or so on the tach. It never stalled through the whole run up.
> full throttle, cruise and reduced RPM (approach), all was well. Mag
> checks were completely normal.
> I'd like to diagnose this problem (that I perceive) a little better
> before I simply hand it over to my A&P.
> What can I do to help limit the possibilities?
> Best,
> Bob

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