Some problems in my Z
 

Hi guys
Without any introductions, I will tell you the story
Today When I started my Z, it sound was louder than usual
It almost sounded like I'm installed an exhaust but I'm not
Other than this, when I was in my way to my work I noticed somethings
The shifting should be soft when I am driving on D, but today there's something wrong
I can feel it when my car shifting
It feels like something pushing my car from behind every time the car shifts
Also I was trying to stop at the red light and when I reached 20 mph, my RPM suddenly went down and came up again
WTF !!!
What's happened to my lovely Z ??

BTW my car is 7AT and it's milage is 64k miles

Any codes? Sounds like your throttle may be off but there are plenty of other things it could be. I'd start with the easy stuff like checking your AT fluid, a code scanner, checking for loose wires/harnesses.

I would also clean the mass airflow sensors... I had a similiar issue in a Mazda when my MAF was dirty. It would stall or near stall and buck sometimes.

Also being in Saudi Arabia, have you checked your filters? Again I'd clean the MAF because the climate may be impacting the car.

Mattp725
I will clean my two MAF's today and inform you if anything happened
I have an appointment in the stealership ops I mean dealership this Sunday to check the tranny fluid

What about torque converter ?? Is there any possibility that the problem could be from the torque converter ??
I am afraid that my gearbox is damaged

I'm not very knowledgeable with torque converters but I would think that if you were in park it shouldn't idle higher if it is a damaged torque converter (but I could be wrong).

Check your engine oil levels!

I'd also try a simple ECU reset. Other odd issues people have experienced have been resolved by simply resetting the ECU (disconnect the battery for 10-20 mins and reconnect).

Guys I went to the dealer
They checked my car and told me " your car is just fine, your car's transmission is fine "
So I will try to reset the ecu
I hope it wil fix the problem

That is Nissan's go-to answer. My engine oil was at 260, it is normal, my diff makes a clunk, it is normal, my clutch sounds like junk, its normal.