93 altima same fuel injector goes bad 2 times in 1 month

when did car run perfectly last, ,1 week,1month , year or decade ago
or never seen by you this, (bought a sick car)? matters huge history see? (cars have bad habit if gaining wrong parts throw random)

in school they teach for over over 60 years the order of testing.
LTFT is reset with scan tool reset or battery lugs pulled.
the real symptom are P300, and weak engine power.
so is lean, and 171 means LEAN.
but do know that both 02 front sensors bad, can tell lean and is a lie.
if bad. they are and none lasted 20 years. but are new now.
so you never checked fuel pressure, per the SM spec,?
CEL flash means errors but the flash means WARNING CAT damage soon and if they get to hot they melt and engine power is lost or worse. vacuum test finds bad MELTED CATS, ASK.

SO IT FAILED DAY ONE IN YOUR HANDS FROM GRANDMA. OR NOT?
why guess, buy tools and test the engine, not gue$$
the ASE rules are and in order are...

1. bad engine (compression test fail, cats melted, EGR stuck open or cam lobes bad.(poor lift) chain cam not bad, Im sure its fine.
2. bad spark ( or timed wrong) or HV wire sets bad, or coil packs wired wrong.
3. bad fueling. fuel pressure wrong, idle or WOT.or both.

injectors clogged. the balance test and leak down test is down per SM..
old oil used for 20 years and HLA are wrecked, with gunk in the hydra lash adjusters? causing valves to leak bad and #1 cause in ASE list.
that bad idle is due to 1 or 2 things,
A: LEAN BURNING AND SURGING
b: IAC VALVE DEAD. (IDLE AIR CONTROLS) OR BOTH.

ALL THE ABOVE, PROBLEMS LEAN AND POWER LOST
MAY JUST BE A WEAK FUEL PUMP OR FPR.

psi SPEC PRESSURE IS. AT FUEL RAIL
OR OMG THE FUEL FILTER IS BAD AND OR FUEL WENT BAD AND CLOGGED THE FILTER AND ALL 10 MICRON SCREENS IN THE INJECTORS, THIS CAR WAS NOT A DAILY DRIVER AND BAD FUEL RINGS TRUE HERE. BIG TIME. BAD FUEL. PARKED.
THE FILTER YOU CHANGES, STOPS,40MICRON DIRT, AND LETS PAST IT , 39 TO 10 MICRO FILTH TO ALL INJECTORS.
SO RUN CHEVRON , INJECTOR CLEANER IN THE TANK
THIS BRAND IS THE ONLY ONE ONE WORTH SALT.
PARKED CARS THE TANK INSIDES ARE FULL OF RUST
i TAKE OLD FILTER (NOW LOST) AND CUT IT OPEN
FOR FINDING GUNK THERE AND OR RUST, AND NOW KNOW WHY INJECTORS ARE PACKED.

THE SM SAYS 3.8l RAIL PRESSURE IS 55 PSI.

i DO MANY ENGINE,TEST ALL VACUUM AND COMPRESSION
SPARK CHECKED CAREFULL
THEN FUELING TEST, PRESSURE CRANKED AND RUNNING AND WOT.(WIDE OPEN THROTTLE PRESSURE 1 SECOND HAND GUNNED AT THROTTLE PEDAL.
BALANCE TEST INJECTORS AND LEAK DOWN TEST.
BAD FUEL CHECKS.
i USE MY SCAN TOOL FOR PID'S AND SEE HOW ALL SENSOR WORK (DATA)
LEARN THAT 02 FRONT SENSOR EVEN NEW FAIL AND LIE IF THERE ARE AIR LEAKS CRACKS IN THE EXHAUST MANIFOLD OR NEAR BY ANY FRONT 02. SENSOR.

ECT MUST SCAN READ 180F OR MORE , NOT LOWER AND IVE NEVER SEEN ANY 20 YEAR OLD THERMOSTAT EVER WORK IN 50 YEARS. 2 TIMES DESIGN LIFE IN FACT. THAT.
CHECK FOR WHAT IS SEEN INSIDE IN FILTER. FIRST.
THAT IS PRIME EVIDENCE TO ME.
BAD FUEL IS COMMON ON OLD CARS, DRIVER ONLY DRIVES 1 TIME PER MONTH AND FUEL THERE 3YEARS OLD. BAD NEWS THAT.

Hmm.. I hope you will find out what was the problem
That's a pretty bad issue

The power through the fuse is to the fuel pump, this only runs long enough to pressure the fuel behind the injectors so that when they open the fuel is an high pressure. So you will normally hear it when you put the key in and turn it, before you start the engine, and then while driving it will be on. Your fuel pump is running longer than usual, because the fuel is not getting up to sufficient pressure. This would also account for the poor running. If you do not have fuel leaking all over the floor, the first thing to replace is the fuel filter. These get dirty over time, especially if you ran the tank dry in recent months. If its blocked the fuel pump tries hard to suck fuel from the tank through it and fails.

Have you checked the catalytic converter? After 20 years they do pug up causing some of the problems you describe

Have you ever put in the gasoline tank any fuel injector cleaner yet because your injectors which injects the fuel of gasoline, if the injectors are not injecting enough fuel into the piston chambers that the fuel injectors needs to be clean to allow enough fuel to come in so go buy injector cleaner at autozone and put the whole thing into the gasoline tank and then drive. Your fuel injectors are clogged or going serious bad on you so you might have to replace them as well but first try to put fuel injector cleaner and see.

You have two coils on this engine. Test each wire for spark with the engine running. You'll find at least one wire not sparking. replace the coil that has the wire that's not sparking.

CYLINDER 1 COULD HAVE A BAD FUEL INJECTOR.OR SHORT IN THE WIRING TO 1 FUEL INJECTOR.

#1 bad fuel injector or #2 clogged catalytic converter my bet is the injector

you have intake leak.bad spark plugs and wires.your fuel pump in gas tank.

Sounds like a fuel problem. Replace your fuel filter and add Techroline (Chevron product) fuel injector cleaner to clean your injectors.