fuel, pump or regulator. also fuel injectors could be fouled. also check your compression,,, wet and dry, dry first
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Either exhaust restriction, like a clogged catalytic... VERY common in Nissan, as they choose to mount the cat so close to the engine. Or fuel restriction / pressure issue. Something is limiting either the amount of air or amount of fuel that the engine is trying to move. You can do a fuel pressure test, but even if pressure is OK, flow might be an issue if something is clogged.
Get a fuel pressure test done on it to see if it may have low pump pressure or if the fuel rail regulator if sticking / faulty.
2001 Nissan Sentra 1.8L automatic transmission with only 106,000 miles
The engine is bogging down and there is a loss of power. There is NO CHECK ENGINE light on and I ran an OBDII check anyways with NO CODES
It doesn't sound like there is any misfire or sputtering, and the plugs look fine. The air cleaner is brand new.
