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I have a M38 1950, with 24V electric, and most details orig.
Bur carburettor is from CJ-2A 1947.
My problem is unstable ideling.
Some days ideling is perfect,
next day no idle.
Other days varying idle.
Where shall I look/do to undersand what to do?
please help!

Thomas Bjorkman, Sweden

I think somone have imported My M38 from a US Military
depot in Euroup.
M38 are very rare in Sweden.

Clean fuel only, clean out the carburator, no vacuum leaks at the carburator base gasket. John

In addition to John's suggestions above: Check throttle shaft for looseness. When the holes in the throttle body wear a lot you get an uneven idle that will clear up a bit when the hole gets dirty enough but when a period of high vacuum occurs and sucks the dirt out then the rough idle is back.