Engine failure

I had a situation in the Shenandoah Valley where, during runup when I
checked smooth operation at idle, the engine quit. It started up easily
enough, but quit again at idle. Taxiied back, went to the shop and they
poked around with the plugs and a few other things, finding nothing.
Their theory was that it was carb ice.

Never had carb ice on the ground before.

Several hours later I took off with no problem (during taxi and runup I
applied carb heat periodically).

Plane was a Dakota.

Jose
--
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