u/Smart-Sentience

i have a 2000 jeep cherokee xj with a problem of sputtering/varying rpms that dip down and jump up coming almost to a stall when the vehicle is cold but only when i narely give it gas(just Crack open the throttle body) i have replaced the battery the alternator the ignition rail the sparkplugs the throttle body including the tps and the iac valve sensor i have replaced both the cam and crank sensors as well as all 4 o2 sensors. since replacing the o2 sensors earlier today i am now pulling a p0138 code and the sputtering has become slightly worse but at some times has remained the same as before. what could be causing my problem and what should i check or fix next? Always appreciate the help but im about on my last leg im out of ideas besides buying a fuel gauge pressure tester 🤷‍♂️ PLEASE HELP send me your knowledge Jeep people 🫡

Alright guys ive finally decided to cave and make my own post regarding some questions. Ive got a 2000 Jeep Cherokee XJ ive been running into some problems since picking her up a few months ago. When cold and even sometimes when warmed up (less often) I run into the issue where when creeping or easing out (as in just cracking open the throttle body i.e minimal gas) from a stop the rpms start to spotter like crazy and sometimes nears a stall. My corrections/fixes so far, she wasnt charging/holding a charge needed both an alternator and battery. Cylinder 3 misfire replaced spark plugs and the ignition rail. Replaced both cam and crank sensors (factory synchronizer still), replaced the throttle body which came with all the sensors. All of these fixes have seemed to make my problem slightly improve so im on the right track id hope but I cant seem to nail down the ultimate cause of the problem ANY HELP IS APPRECIATED THIS IS DRIVING ME NUTS.