If the engine quits as part of the runup “throttle idle & carb heat on” test, that is a sign that the idle setting is too low, the idle mixture too richt, or a magneto timing is off. This is terrible for the spark plugs, and I assume after some time the plugs would get so terribly sooty that the engine does in fact quit then. From my experience, I can run a 172P at low idle (throttle pulled out as far as it goes) with the carb heat fully pulled (to make it even worse) at about 450RPM or so for a while, and it won’t quit. Reciprocating props will need to have their idles adjusted, perhaps a bit higher, particularly if your idle adjustment is. If you find weird jet engine N1 behavior, please report a bug ASAP!
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