Misfire, but no DTC's?

[Fabricator]

The engine will not rev up fast. no power. lack of full power infact yours is pathetic, power.
what does it take with this car this engine.
engine must pump air compression ok CAT not melted,, and fuel pressure at spec and at spec, with engine bogging? , and MAF good. injectors not clogged, that is all it takes mostly.
The MAF is chicken and egg deal, it allows Acceleration to happen, for sure up a hill or>>> see next tests.

Your O2 does swing in CL but that only works at gentle RPM no load on engine, no TRANSMISSION STATED YET (the O2 is offline at WOT so we skip O2, )
the reason to look at 02 is all other modes of engine load, to see it works at idle and say throttle at 2000 RPM in neutral or driving say 45mph flat ground and see CL happen, ( bet this fails)
no driving allowed, as car is unsafe on the road, so ... we do it like this.
if this car is a AUTOMATIC we can use it for a DYNO, ever do that?
The built in VIRTUAL Quasi DYNO !
what does that mean well in the service manual is the 4speed stall test.
if you chock the wheels, and set hand brake, left foot on brake hard, right on throttle, and hot engine, in park ,car not pointed at Kids Day care center (sarc, pun)
shift now to DRIVE. (dyno mode, free) the only thing I like Automatics for is this.... fun test.
and the do the A/T TANNY offical stall tests, with scan tool logging data, for sure clean MAF.
We can plot maf/TPS reading, maf over throttle angle.
to see if the MAF shows more than 20 that you got before, the test 5 seconds max, reset for 1min repeat or you overheat the TC. (and ATF fluid)
http://www.fixkick.com/videos/FLV-all/showtime.html#MAF (seen here under maf/stall tests) grams/second,)
the TC limits RPM at 2000 (dyno load) and 21grams/second MAF readings, if maf is weak it ill not hit 20 nor 2000
when do this on tall hill , demanding 95HP from the engine 100% load grams/second on mine was 55 (96, G16b 16v)fully tuned up car, and perfect compression
at sealevel above sea level is less. 3% less per 1000ft. per pilots book. 55 is max, at sealevel.
the maf is a key sensor on this car,unplug it see if power returns, (but will that is limphome mode and spark advance is was as will be power)

my list from post 1.

why not do signature here,
like this," Suzuki X90, 1996, what transmission?, what drive line? 4wd or 2wd?"

and my red list?
NO TRANSMISSION STATED? 5-speed manual & 4WD
NO SPARK PLUGS STATED (J PLUGS AND gap SETTING at 0.028" not NGK machine set at 0.045" as all are.!)? Plugs are recent, and are J-style gapped at .028"
NO country stated, USA or Canada, the ECU is not the same in both countries, so I must ask country,sorry. The emissions sticker on the hood looks similar to your '96 sticker you posted earlier, so US spec
No new FUEL filter? I have not replaced the fuel filter, but will check with PO if he did
IS TANK FUEL BAD, IS IT OVER 15% FULL, IF NOT DTC do not set for P0300. (ok we know its not below 15% now)
NO outdoor temperature stated. please tell me that. Line 15 of the scanner data shows the inlet air temp which should be close to the outside air temp that day... but with 22 deg. C being almost 72 deg. F, I don't think it was that warm that day.

knowing this we can ignore vast numbers of tests. all wasted.

what is known.
engine is ok, it is not a bad engine,
my guess is injectors will pass the balance test and are not clogged but only based on 'new injectors put in"
the fuel pressure I guess is ok in frame 15, as it MUST BE.
the next is maf , clean it, really this is a 50k mile service point.
if car is driving on a highway fast or on 8 lane freeway,the air that lands on the car is nasty full of oil and crap, and the MAF eats that crap and cokes up.
in town car only not likely.

the maf needs to be cleaned using the can and straw with 8 " inches gap from end of stray to MAF . keep your distance,
and hit it 3 times, 1minute soaks each, time, or more, 5 even if filthy max.
what happens with a dirty MAF
it Under reports air.
and the ECU can not inject fuel correctly with any weak maf, and will bog'
one test it unplug the maf , go to limphome does power wake up, yes, MAF is bad. or just dirty, its just tuneup step on all cars with maf.
some cars have a MAF that self cleans, at key on, I do not think this maf does that. so is a SERVICE POINT or as old guys say TUNE UP step.
in short , weak maf or injectors clogged or low fuel pressure , at frame 15