I have a 99 legacy outback that has got me stumped! Everything is best with a little background, so here is mine. I have owned the car for 2.5 years and have put on about 20k miles (currently at about 134,000). There have been no major repairs that I know of, and the timing belt was replaced 10 months ago. I have had no serious issues up until.....The car was driven by a friend 200 miles, then parked in his driveway. The parking lights were left on, killing the battery. Two weeks later I came to pick up the car, and discovered the battery. I charged it back up, then went to start the car. It idled very low and rough, requiring a little throttle to remain on. When I attempted to bring the throttle up, it would reach 1000-1200 RPM, then immediately drop to 300. There is a bunch of smoke, that seems to smell a little odd, but that might just be my nose.
There is no CEL on. I changed the plugs, plug wires, and fuel filter. I did not have a pressure gauge for the fuel line, but fuel squirted right out when I turned the engine over. I cleaned the PCV and checked all the fuses. There is no obstruction in the air filter.
At this point I am stumped. A CEL sure would be nice! Anyone have an idea, or experienced this?