I honestly have no idea what’s going on with this car

What is your question?

So I have a 2002 Subaru Legacy “wagon” and at idle it very Subtlety goes up and down it bogs down at low Rpms if your driving it at low speeds it will backfire and when pedal is to the floor it will barley accelerate and then it grabs and starts racing “while floored” and at the absolute worst will just turnoff Was at a stop sign and it died halfway through the turn ended up pushing it home (only up the street not far) I have looked into the problem a little bit and got a slew of “could be” problems the car did run out of gas on me once and ever since then it does seem like it has slowly gotten worse and worse I’ve only changed the fuel filter so far to no avail so instead of wasting time and money replacing parts that my not be the problem I’m waiting to get the code read but per the slew of problems I may have it could be the O2 sensor ,faulty sparks / spark wires, fuel pump, fuel injectors, master airflow sensor and somewhere it could be sucking to much air in I have no idea

What makes this problem better or worse?

Only time the car seems to run right is when it’s completely floored but even then at times I can floor it and get no response from the engine

How long has your 2002 Subaru Legacy had this problem?

Month or so don’t really know