pedrolucas

Hi, and thanks for reading my post. Recently, I have a little problem with my d15b. When I'm at a stop light, it idles rough and do random misfire. I think it maybe something in link with the fuel pressure. When I disconnect the top vacuum hose of the fuel pressure regulator it seems to idle way better. I guess it could be dirty injector or clogged fuel filter. I have new spark plug, wires, distributor cap, timing ok, o2 sensor ok, no CEL in link with that, straight pipe 2.5'', cold air intake, no vacuum leak, new throttle body with new tps.

Ok, few days ago I went to the scrap yard to get a new TB because I've got CEL for the TPS. Since I've replaced it my idle seems to be as bad as before, but sometimes it jump between 900 and 1500 constantly. It does that only when it's warm and sometimes it stops. It figured out that it was a bad TPS cause when I pull the throttle cable more then suppose, it became normal( but still low )

Ok now something new, I've seen that my post cat o2 sensor is broken, but no CEL, and I don't have any cat. So could it be the problem ? I'm running onto a JDM version of the obd1 ECU p28 and I'm not sure if I'm suppose to have that second o2 sensor or if it doesnt come with that engine normaly. All my wiring is on a OBD2 harness so maybe that second 02 sensor plugg into the harness but not into the ECU ?