Problem in the game hiunday accent `98

Hello friends, I have the next problem, every time the vehicle (Hiunday Accent) is a couple of hours, when it gives it it costs a world that starts, but then that part and if I stop as many times as part without any problem, the problem only occurs when it is a long time stopped. They tell me that the following elements can be failing: detonation sensor, fuel pressure regulator, fuel pump. What will it be?
I hope you can help me, thanks :(

Convenient to measure press combustivel na time of sharing or engine and conferred with manufacturer.
Power tamm being deficiency of temperature sensor do motor, no case measure !!!! resistance x temperature !!!! and confer com Tabela do manufacturer of the veículo.

FRIEND THE MOST POSSIBLE THAT IS PASSING IS THE THEMERATURE SENSOR ME

You must measure fuel pressure, or it can also be the pressure regulator ..