My first time was as an instructor with a student. We were climbing out from Tulsa Int'l. at 5500 ft when without warning (NONE of the signs you learned were supposed to happen) the RPM dropped to 1400...then went back up. Then it dropped again...then back up. It continued to do this until I put it on the ground at a nearby airport. Oh, and of course, it was 1130 at night. Even after 45min. on the ground, it still sputtered. My boss came and got us in the 310. Next day we went back up, and nothing. Ran perfectly. Has to this day...that was about two years ago.
