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You've posted a number of things, and it's difficult to sort it all out because there's no exact timeline. That's not intended to criticize, because I understand how frustrating this has been for...

O2 sensor failures apparently come in a bunch of different flavors. I had the upstream O2 on mine throw a heater circuit code, but there was no performance problem, misfire, or loss of MPG. And...

Yep, really they're really piling it on you! Is it the factory muffler? I'd be a bit surprised if it is, because both of our Aveos had the muffler pipe rust out where it meets the mid pipe. ...

Well that's a REALLY interesting result that you posted! The possibility that both O2 sensors are bad, but only one is setting a code makes for difficult diagnosis, to say the least. But a bad...

Those readings confirm that the O2 connector and wiring are ok. And you previously said that you swapped the upstream and downstream O2 sensors, and the P0141 was still set. Although that would...

Here's the information for testing the downstream O2 sensor circuits. For the first 3 wires, you'll be measuring the resistance from the sensor connector pins to various pins on the 2 ECU connectors,...

Yes, definitely that corrosion sounds like the cause of the P0141 code, instead of the sensor itself. Perhaps the connector is shot due to the corrosion, and resistance testing would be the way to...

I was assuming that with a flashing misfire, there is also a noticeable performance problem. But are you saying it's running well even when the CEL goes on? If so, yes that would change what I was...

You are getting a code that says the ECU is not reading O2 from the downstream sensor when it expects to. That makes starving for air, or a plugged cat much more likely suspects. However that brief...

All the multimeter can tell you is that there is something coming from the signal wire, but not if it's good or not. The signal voltage is changing many times per second. However your multimeter...

I'd be really surprised if replacing the PCV resolves the misfire. The P0300 can be caused by many things, but you've already eliminated quite a few of the usual suspects. Your description of...

Was that the same guy who told you 165 compression is good? You've been getting some SERIOUSLY bad advice from these people. The voltage that you're seeing on those 2 crank pins with the key at...

I obviously can't know exactly what you're seeing that looks burnt, but you need to consider this logically. It takes lots of juice to burn wiring or plastic, and it's hard to imagine that level of...

One thing for certain is that it won't start or run if there's a really bad crank signal. Ripping wiring apart is the worst possible repair, and you shouldn't consider doing that until a bad crank...

Is the reading holding steady now at idle? Your vacuum reading is a bit higher than mine, but 21 IN/HG is in the normal range, and altitude may be part of the difference in our readings. But if the...

I'm assuming the units for your MAP reading are IN/HG, correct? My '05 MAP reading is 10.6 IN/HG at a (warm) 860 RPM idle. So if your 10.6 is at idle, then that reading is right where it's supposed...

I'd want to see what the compression and vacuum tests show now, before doing anything else.

I can't say for certain that 1 tooth off would cause lower compression, but it certainly has a highly likely probability.

Well, as I posted previously the (dry) compression on my 13 year old '05 is 200+, so I can't go along with 165 being 'good'. But it's obviously your decision how to continue troubleshooting the...

With the vacuum fluctuating along with the lower compression, I can't help thinking there's some type of internal problem. It might be a big help if you could find a leak down tester to try...

All of the first gens have had that intake hose rip, and it normally doesn't affect anything.

I'm assuming your gauge is measuring CM/HG, in which case the readings are in the normal range. ...

I don't think there's any way the downstream O2 could be causing the misfire, but you need to get it replaced in order to get valid realtime data readings such as fuel trims. Also try to find your...

You mentioned a Chevy mechanic earlier. Did he not run a fuel pressure test?

A clogged filter could definitely cause the symptoms you're getting. You might want to investigate what the black stuff is, and try to figure out if there's any more of it still in your gas tank.

A better OBD reader (Torque App, etc.) may be helpful, but here's a few tests to try.

Is the misfire causing a noticeable performance problem? If you can hear it stumbling as you rev it up,...