As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN INSTRUCTIONAL FLIGHT, THE PILOT REPORTED A TWO TO THREE SECOND ROUGH ENGINE. THIS WAS ON FINAL AND OCCURRED BETWEEN 400 FEET AND 100 FEET. SUBMITTER STATED THE AIRCRAFT HAS A HISTORY OF MOMENTARY POWER LOSSES AND IS CURRENTLY GROUNDED PENDING FURTHER INVESTIGATION.