I want to ask how to resolved faulty of engine (...

Dear Sir
Welcome, and thank you for trusting us
while you Replqcing oring seal of injector. Injector, injection pump, feed pump. Anything else you want the mechanic to know 
and to solve the problem check the car on OBD II device to fined the malfunction code and you can also send the code to find the problem 
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Kind Regards
Engineer mohammad