2007 Toyota Corolla Car Stalling

Engine Mechanical problem
2007 Toyota Corolla 4 cyl Two Wheel Drive Automatic 62000m miles

hello,
Toyota corolla NZE 1.5 (japan version)
Recently car stalled - always did the necessary maintenance)
Got the following done after stall(routine maintenance):changed spark plugs,flushed brake fluid,flush transmission fluid,clean injectors.
STILL STALLED;
then serviced trottle body.
STILL STALLED;
Changed fuel filter;
STILL STALLED.
Stalls in a topical climate, when engine is either cold/hot. starts back pretty easilt. Diagonistic does not pick up anything