troubleshooting engine miss??

[mugenteggy]

Hey guys i need some help. I have a distinct miss thats gonna be a pain to figure out i believe. First of all it only misses when warmed up to operating temp. When cool it doesn't do it at all. Second it only does it from idle to 3500rpms when you put it under a load. It especially does it when you're in too high of a gear running lower speeds and put it under a load. Above 3500 it doesn't do it at all even when warm. The other problem is that when its warmed up it takes forever to start most of time as though it was having fuel delivery problems or possibly too much fuel. It has actually quit on me a few times while idling and it when pulling out in 1st gear it usually always misses a lil if i'm light on the gas or heavy. I have a stock motor with bolt ons and the fuel system is stock. I always run 93 0r 94 oct and i just recently put on a new fuel filter but that didn't fix it. The plugs are just fine and the ignition system is brand new. I'm thinking the only other possible solutions would be, fuel pressure regulator, possibly the pump (but i doubt that one), dirty injectors, or maybe my its time for a new o2 sensor. The gsr has always given a code 43 since i've owned it but never had a problem till now. The code 43 stands for (fuel supply system). I never was really sure what the code meant if anyone can help please let me know. Thanks so much. Ryan

[mugenteggy]

ok i just did some mad researching on ********** and its mainly been the o2 sensor. Makes sense to me because there were a few people that had untuned cars that were running extremely rich and it basically killed the o2. And i recently did the cheap skunk ecu chip just because i was bored and curious, it ran extremely rich and terrible so traded that ecu for a stock one. Also i read cases of using a new but not factory 02 sensor still didn't fix the problem but when replacing to a new factory unit it did fix it. So what i want is a stock o2 sensor of course. Anyone know a cheap place to order one. Any help is appreciated. Thanks again. Ryan

hey guys i think i'm just gonna try cleaning the o2 first. Whats a safe cleaner for an o2?