Nissan QG 13 has no strength

I agree with the others. First, you need to check the basics: fuel pump pressure, spark plugs, and spark plug wires. These things can cause the engine to lose power


. Then you should check the timing and make sure it's properly synchronized.

Also, check the MAF sensor. "But the problem here is that the throttle body or the accelerator pedal isn't responding."

Regards.

It's most likely that your catalytic converter needs replacing. It's clogged, preventing the proper flow of exhaust gases. If it's a fuel-injected car, it could also be the MAF sensor. Good luck.

My friend, first check
the fuel filter to make sure it's not clogged
, then the spark plugs and ignition coils to make sure there's no current leak from the coils, and finally the exhaust valve clearance.
These are more prone to closing (if it has an EGR valve), and that's why it's not running well and feels sluggish.
Use a feeler gauge to make sure the feeler gauge passes 0.009 inches.