The injectors can be cleaned. The easiest way would be getting a bottle of fuel injector cleaner, and put within the tank. Further cleaning would require getting the vehicle to a workshop, so they connect the injectors to a cleaning machine and they clean thoroughly, and check the spray pattern.
The turbo cannot be cleaned.
I would not suspect a coil at this stage, as those usually set a fault code, and the engine light would illuminate.
I would first check the engine oil (as dirty oil could do problems with the variable valve timing and cause this), and then i would check the intake air hoses, and the turbo hoses, check these common faults causing similar symptoms:click here for details
Additionally i would check the EVAP hoses (fuel tank evaporation hoses, tank and valve).
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