Alright, I'm kind of at a point where I have a few ideas of what could be wrong with my car, but I'd figure I'd ask Zilvia if they've had similar problems and knew the resolution.
I've got a fully rebuilt (to factory spec) redtop SR in my s13 hatchback, everything on it is stock. Injectors, ecu, MAF, SMIC etc. I have a megan FPR, z32 fuel filter, walbro fuel pump, apexi air filter, koyo radiator, stock T25.
I'm having a problem with misfiring. From what I've noticed, when its cold out, it's a lot worse and seems to misfire a lot more than when its warmed up. Upon a cold start, at idle itll occasionally do a slight misfiring every now and then, once its warmed up the misfiring goes away at idle.
The other misfiring problem I'm having is above 4k when I dump the throttle. I've noticed if I gradual the throttle and go above 4k it won't misfire, itll keep gaining in power like normal, but if i go from say 10% throttle to WOT, itll misfire pretty bad (seems to be only one piston), almost feels spark related if I had to say so.
I don't have a boost leak. I've already checked that. I checked the resistance on my injectors and they all check in. I've replaced the o-rings on the injectors. I don't think the problem is fuel related, I'm leaning towards coilpacks or the ignition timing (or maybe even the TPS sensor). Replaced the MAF with a known working one. I did a compression test and got 140psi across the board. When its warmed up it idles steady at about 850 rpm. Occasionally misfiring very slightly every so often. It almost seems at about 1500rpm to 2000rpm somewhere in there itll stumble a little bit for a sec.
Other than this the car is running great, sounds healthy, no leaks of any sort, I know its something simple I'm just trying to pinpoint it.
