My Japanese SR20DE has been running real rough lately. Cold starts the idle is real loopy and then once it warms up it wants to stall (and sometimes does). Appears to be running super rich as I am fouling out a set of spark plugs every week or so. I have recently replaced my cap, rotor, fuel injectors, plugs, fuel filter; nothing has really helped the issue. No internal engine mods. Any advice/help would be great. Just looking for what direction I should be heading next without throwing money aimlessly at this project. Thanks.