Nissan Repair: nissan skyline problem, nissan skyline gts, skyline problem

Question
Hello, dear expert?

I've got nissan skyline GTS-4. But it is have an engine damage.
The car is taken more than 2 times to car service.
After service it is stopped many times in the middle of the road and does not started. It is sucks more fuel. Tramsmission gear is not working on 1 and 2, just works P, R, N and D. Something is broken and replaced another japan car's same thing but not match well. Now it is in garage.
By the way, I'm from Mongolia and  
I could not find this type of skyline's engine. I searched internet to find an exact engine and asked car services.

I want to know how can I fix this car and if need to change engine
where I can find it?
If I can't find engine of this type which another car's engine is
match for this type of nissan skyline and this car can be customized? Also where I should search parts & things of this car?

One more question, it is maybe sounds silly, but I'll ask.
Do you know experts who are you works in another country to repair car problem? If yes let me know, maybe I' hire to fix this car. :)
me know, I wanna

This car's infos are below:

Twin cam 24 valve, 2500.
E-enr33
chasis no:enr33-002337
model:BGKNRGAR33EDAB
1N4 K, rB25DE 2498,
RE 4R 01A RC43, 5

Thank you for your consideration and hoping for your soonest reply and merry X-mas! :)

Answer
Hi Anha -

I apologize. We do not have that model car or engine here in Hawaii, so I am going to have to recommend that you go to a forum. the link is below, and perhaps you might find your answers there -

http://www.skylineowners.com/forum/showthread.php?p=950361

Hope this helps -
aloha
Calvin