My injected 360 does that too, more so in the winter.  My mechanic says it is
because of the extra fuel used getting it started in cold weather.  And it
clears up when the temps come up (like higher power settings for take off).
Sometimes it will clear up if I lean agressively with high power during the
ground runup.
Matt McManus
LNC2 360

Quoting gerardoconnell@optusnet.com.au:

> Running an 0-32O with 2 mags-frequently get a 200 RPM (or sometimes greater)
> drop with  roughness on the left Mag when doing run ups.
>
> Until recently I had the MATCO brakes installed I was unable to run up much
> past 2000 RPM without creeping forward and thus the problem was hard to
> clear. On applying full power for take off-the engine runs a little rough for
> a couple of seconds then runs smooth.
>
> Obviously the cause is fouling-anyone care to add comments or similar
> experiences?
>
> I always taxi with mixture leaned out to the max but mechanics can be more
> careless when picking up aircraft for maintenance.
>
> What are your thoughts?
>
>
>
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