Jooseppi, just saw this, and read through it all. Fuel injectors are a good bet, especially if high miles. Over time the penals get grit in them and the springs get weak, so spray pattern and closing is affected. I was going to do the Volvo's just because, but now it has a new home.
The seals on the injectors can go bad and lead to smelling petrol also.
For rebuilding, this is the place:
Fuel Injector Cleaning Service and Flow Testing - Injector RX They even balance them, which a lot of injectors from the factory were never done.
On the Volvo, which also was OBDI, it was a F.I. relay! Though I did have a major improvement replacing the main fuel filter. A clogged filter can cause a rich condition. Though I am sure you already replaced this.
Oh, and how is the Camry feeling about your new love and relationship? Is she jealous?
