pain in my butt.
ok, i have a 1999 jeep cherokee sport, straight 6, 4.0L engine. i recently changed the plugs, wires, distributor cap/rotor, and it was running good till the check engine light came on and it started stalling out. i brought it to advanced and they said it was my o2 sensor between the cat/muffler. i changed it, and it ran good for like a week. now, i have no check engine light on, and its running like poo. keeps stalling, real sputtery. it was running good. idk why its not anymore. all plugs seem to be firing. what could it be? im a pretty good not schooled mechanic, but i got no check engine light to work with, and dont know where to start. it sometimes starts right up and runs like poo and sometimes it wont start at all. if anyone has any ideas, shoot me a reply and i will rip this thing apart asap