does my 2010 subaru forester need its engine control module update after replacing a broken engine

the original engine was said to be damaged due to broken timing belt. The car was then sold to a middle man who got someone to put in a compatible engine, said to have 70K miles on the clock. As I have to run the car uphill and stop for traffic light, the engine trembles and comes to stall at the hill top even if the blue temp. warning light has turned off

I have a suspicion that when the engine has not reached its operating temperature, the idoling speed should be kept slightly higher, that is the function of the crankshaft sensor, any comments?