ka24de hesitation and misfire?? plz help!

[ShimiBoi]

like the title says i have a small problem, plz dont flame me...i did search and found some things that might help and tried them with no avail :wtf: so any help will be appreciated :newbie:
things that might help you help me:
nearly stock ka24de with
-intake
-secondary butterfly delete
-cat-back exhaust
-msd blaster ss
-new ngk iridiums
-new ngk wires
-new cap and rotor
-new ignition coil wire
-throttle body spacer
-working egr
-connected aiv
-fuel filter replaced about 5k ago
-s13 auto ecu on stock manual s13.
-stock injectors [email protected] ohms [email protected] ohms [email protected] ohms [email protected]

problems:
-at start car is very hesitant and doesnt want to go, but doesnt misfire...just kinda bogs down until about 2500rpm (cold start).
-after it starts going car seems to run well under load.
-while decelerating with very partial throttle (ie. to slow the car down but not too fast) in gear car misfires
-at ~2000 rpm (while decelerating in gear) misfires several times and car gets a lil jerky.
-in neutral and revving up car will occasionally misfire after 2k
-under full throttle no misfire is noticed
-gas mileage has dropped from ~26 to ~24mpg (due to the auto ecu i presume)
-starts up fine even when cold

thank you zilvians for your help ahead of time!

[Frankiegamer]

You virgin! Did you get the LSD? Lol

[Butcher240sx]

Replace the 02 sensor.

[ShimiBoi]

Replace the 02 sensor.
i just replaced the o2 a couple months ago (May i think)...could it be dead already? Thanks

[ShimiBoi]

You virgin! Did you get the LSD? Lol
nah fuker....it was an open diff...u guys made me waste $4 and 2 hrs of my life :fawk2: :mrmeph: hahaha

[Butcher240sx]

Try swapping mafs then ecu for ones known to be good. See if that helps. Test the chts also.

[ShimiBoi]

Try swapping mafs then ecu for ones known to be good. See if that helps. Test the chts also.

Sorry, but what is the chts? Will an s14 maf work on an s13? Thanks

[Butcher240sx]

You need a s13 mafs. Chts is cylinder head temp switch. Its the two wire sensor. The one wire is for the gauge.