Also you might want to check the ignition harness. Sometimes when they are unscrewed they bind up and twist off the wire.
Ive always run the resin filter in the tank of my M38 and have had no problems. but changing it or cleaning it as the TM describes would a good idea. The carb has only basic idle air adjust but the idle circuit is sensitive to contamination also a diaphragm may be perforated. If all else fails you might want to do a carb kid. Midwest military has a good one.
