Ubatz

It does have that black carbon water yeah!

I suppose I could mention I haven't done the plug wires or coils yet though. Haven't really thought about that

Nope. It's all clean around there. Replaced stuff and haven't seen any wet spots even under pressure. I'm beginning to think it's running rich because it's been smelling like it lately so I need to check for an exhaust leak before the o2 sensor.

I did a tune up but not the plug wires and I haven't checked the coils either honestly. Plugs don't even have 10,000 miles on em yet. Might need to check the air filter again too.

Right now, my 1991 Subaru Legacy L Wagon is just getting worse and worse mileage as time goes on. I want to assume it's because of the o2 sensor. It's approximately 18 to 20 in the best averages when I drive it like grandma. Other than that, the fuel gauge does not last long and I use 10 gallons before I know it. It used to get anywhere from 23 to 24. I'm in the money struggle enough as it is and this is just making things horrendously worse. I need some help asap if possible.