What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
While on approach to lzz runway 34 under VFR conditions with clear skies and a slow wind from the north east and temperature at approximately 60 degrees fahrenheit, the pilot observed that he was too high. Pilot performed forward slip with right rudder and left aileron input and began losing altitude. A short time into slip the engine RPM reduced to 700 RPM. Pilot immediately removed aircraft from forward slip and attempted to regain engine power. Engine power never exceeded 700 RPM after initial loss. At this point the pilot was gliding towards runway and landed aircraft in grass approximately 200 feet short of the runway. Once on ground pilot completely shut down aircraft and reviewed cockpit. Upon inspection, the pilot noticed that the fuel selector switch was in left and should have been in both. At this point the pilot suspected the cause of the engine malfunction was fuel selector switch not being in both and attempted to restart the aircraft. Aircraft restarted and engine performed to specifications. The pilot then taxied aircraft back to hangar under its own power. No aircraft damage or injuries reported.
As the FAA filed it
WHILE ON APPROACH TO LZZ RUNWAY 34 UNDER VFR CONDITIONS WITH CLEAR SKIES AND A SLOW WIND FROM THE NORTH EAST AND TEMPERATURE AT APPROXIMATELY 60 DEGREES FAHRENHEIT, THE PILOT OBSERVED THAT HE WAS TOO HIGH. PILOT PERFORMED FORWARD SLIP WITH RIGHT RUDDER AND LEFT AILERON INPUT AND BEGAN LOSING ALTITUDE. A SHORT TIME INTO SLIP THE ENGINE RPM REDUCED TO 700 RPM. PILOT IMMEDIATELY REMOVED AIRCRAFT FROM FORWARD SLIP AND ATTEMPTED TO REGAIN ENGINE POWER. ENGINE POWER NEVER EXCEEDED 700 RPM AFTER INITIAL LOSS. AT THIS POINT THE PILOT WAS GLIDING TOWARDS RUNWAY AND LANDED AIRCRAFT IN GRASS APPROXIMATELY 200 FEET SHORT OF THE RUNWAY. ONCE ON GROUND PILOT COMPLETELY SHUT DOWN AIRCRAFT AND REVIEWED COCKPIT. UPON INSPECTION, THE PILOT NOTICED THAT THE FUEL SELECTOR SWITCH WAS IN LEFT AND SHOULD HAVE BEEN IN BOTH. AT THIS POINT THE PILOT SUSPECTED THE CAUSE OF THE ENGINE MALFUNCTION WAS FUEL SELECTOR SWITCH NOT BEING IN BOTH AND ATTEMPTED TO RESTART THE AIRCRAFT. AIRCRAFT RESTARTED AND ENGINE PERFORMED TO SPECIFICATIONS. THE PILOT THEN TAXIED AIRCRAFT BACK TO HANGAR UNDER ITS OWN POWER. NO AIRCRAFT DAMAGE OR INJURIES REPORTED.