Hi folks, looking for some help with a misfire/sputter on a 1998 V70 N/A (537xxxkm). Car was throwing some codes for the rear O2 sensor, but wasn't doing anything funny. Coming back from a camping trip, it started to misfire/sputter while cruising at 100km/h in 5th gear. It then started stalling out while at idle. I replaced the rear sensor, and shortly after, it started to throw codes for the front O2 sensor (slow response, and lean mixture), and do the same thing.
It is fine on startup, but sometimes will have little fits of stalling at idle, and sputtering/missing when accelerating/cruising. When it would stall, I used to be able to get it too restart on the first try, but now it usually takes 2-4 cycles of the ignition to get it to catch. Once I give it some gas and take off, it improves a little, and just seems to lack a little power. When at idle, you can also smell the exhaust, which normally is very clean.
Today I replaced the front O2 sensor. The car ran well for 30min, then threw the same codes, and started acting up again. I've tested the PCV and the compression, and both are fine. The spark plugs are new, but the rest of the ignition system (Coils, leads, rotor) are older. I'm thinking this sounds like either an ignition system problem, or a fuel system. I'm not sure how to run the normal relay test, because it it is really intermittent with its sputtering/stalling. (Currently there seems to be about a 50/50 chance of it being fine, or acting up when I take it out) I'm probably going to redo the ignition system, because the car needs it anyways, but am wondering what else this could be.
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