SOURCE: Subaru Engine Vibration
I'd suspect a vacuum leak in the inlet manifold, check to see if any vacuum lines might have fallen off. This can cause a lean misfire at idle, but often it's not enough of a leak to make it lean enough to misfire at higher rpm. If a leak is not obvious, check if it is a leak by buying a can of engine start (or even CRC will do) and spray it all around the inlet manifold. If the idle smooths out while you're spraying then then goes rough again, it is a leak. By spraying in specific areas you can narrow down the area of the manifold or gasket that is leaking.
Hope this helps.
SOURCE: Clutch replacement details for 1996 legacy GTB
Trust me it is quite an excercise and not worth doing yourself. With the proper tools, a hoist and a my mate who is a Guru Subaru Mech it took 4 hours. Without having done it before and without the Hoist ( which is wha I was going to do initially ) I'd say you wouldn't get much change out of 8 - 12 hours.
SOURCE: Subaru Outback - '03 boxer 2.5L engine sounds like a diesel
heavier oil if you are not in a cold climate. but before you do that have the oil pressure checked. We used to use a can of STP every once in a while on a motor in a dodge we had... nothing wrong with it... was just noisy.
Robert
SOURCE: Gas smell with Subura Legacy
there is a recall on some of the fuel lines under the hood, they get old and leak.
SOURCE: 99 Subaru Legacy auto Transmission will not Engage right away P-D
change fluid and filter
Testimonial: "Right on the money!"
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