I just got a 1999 Subaru Impreza (Outback Sport) with 222,000 miles on it. It is in excellent condition for an "old" car. What grade of gasoline should I use?

Remove the rear wheel. There's a plastic road dirt cover over the filler tube. The top of the tube is secured with 2 or 3 small (M6) bolts, in the filler door area. The tube has another 2 or 3 M6 bolts, and is clipped into a rubber hose on the bottom end (this hose goes to the tank).

here you go.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Non-California vehicles: replace every 60,000 miles

Otherwise, it is just to be inspected at 60,000 and then again at 90-95,000 miles.

depends, if it just not working, or if it has restricted flow. If its restricted, get it done ASAP.

no adjustment, computer controlled, you're problem rests elsewhere, do a compression test,

I would do that plus test the plugs, wires and coil pack.

If you have any of the large chain auto parts stores in your area, call them and ask if they do free scans; most do.
If Subaru has maintained the same procedures for a while, and you have checked fluids, etc., you can try resetting the light via the ignition switch:
-Turn on the ignition (don't start) - switch it rapidly between the 'ignition on' and 'ignition off' positions three times.
If the error has cleared itself (not uncommon), the check light will reset. If the problem is still present, it will either stay or come back on.
Our Su has done this a couple of times and with the scanner we have on hand, there was never any particular repeated problem. Just a computer glitch/hiccough -

check all grounds

Most Subarus have a coating on the bottom of the chassis called Cosmoline, which is an anti corrosion compound sprayed on at the factory to protect them during shipping. The only thing I can recommend is to have your brakes inspected for siezed caliper slide bolds, severe rotor deterioration, and sway bar end links that may be broken or are about to break. You should also have the exhaust looked at because that is usually the first to go and the biggest pain when trying to get it emissions tested. I hope this info helps...

check ur idle speed control passenger side in front of intake i think