What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Upon landing, the aircraft engine began to run rough and eventually stopped. While on the runway, a restart was accomplished without success. After pumping the throttle a few times (2 or 5 times) the engine tried to start but back fired causing a fire to initiate within the engine compartment. The crew evacuated the aircraft and the ground crew extinguished the fire. Further investigation within the engine compartment did not reveal the cause of the fire, which leads to possible improper engine starting procedures. There was no substantial damage noted on the aircraft's firewall.
As the FAA filed it
(-23) UPON LANDING, THE AIRCRAFT ENGINE BEGAN TO RUN ROUGH AND EVENTUALLY STOPPED. WHILE ON THE RUNWAY, A RESTART WAS ACCOMPLISHED WITHOUT SUCCESS. AFTER PUMPING THE THROTTLE A FEW TIMES (2 OR 5 TIMES) THE ENGINE TRIED TO START BUT BACK FIRED CAUSING A FIRE TO INITIATE WITHIN THE ENGINE COMPARTMENT. THE CREW EVACUATED THE AIRCRAFT AND THE GROUND CREW EXTINGUISHED THE FIRE. FURTHER INVESTIGATION WITHIN THE ENGINE COMPARTMENT DID NOT REVEAL THE CAUSE OF THE FIRE, WHICH LEADS TO POSSIBLE IMPROPER ENGINE STARTING PROCEDURES. THERE WAS NO SUBSTANTIAL DAMAGE NOTED ON THE AIRCRAFT'S FIREWALL.