After drivivg and come to a stop the engine vibrates. their is no missfire, in park or neutral the idle is good. when at a stop the vibration is bad but if you put it in neutral or park then back into drive the vibration is not as bad
Did you recently replace the axles on the vehicle? This problem commonly occurs in Subarus when you replace the axles with non-OEM parts. The only fix seems to be to swap out the axles for OEM parts. Search the forums at subaruoutback.org for many stories of the same condition and some theories on why non-OEM axles cause the problem.
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have you checked the engine mounts, weak engine mounts can make it vibrate, if you could tell me more were the vibration is sounding like its coming from front or back it may help more to find the problem. also have you had the balance weight checked on the drive shaft. this can cause a problem like this. if you have a ring on the drive shaft there is a ring, then it is missing. and that is why you are geting this fault. you will need to have a new one fitted.
I concur with anon263. When we replaced driver-side axle with an aftermarket one, the vibration was horrible. Most people around me would not believe that was the cause, but as soon as we replaced it with a Subaru OEM rebuilt axle, the vibration disappeared. Get a new one from Subaru if you can afford it. Here's hoping the rebuilt one will last, although some out there have said that it may cause other problems down the line, most likely just because it won't last as long as a new one. The aftermarket axles, with exception of MW, are off just enough in their designs and spline size to allow harmonic vibration to transfer from the engine to the wheel and then your steering wheel when you are stopped at a stop sign and still in gear. The vibration usually goes away when you put it in neutral or park. In my case, I even thought I detected some strange vibration when driving.
This sounds like one or more of your motor/powerplant mounts is broken. Here is an easy test:
Have someone sit in the driver's sear with engine running and trans. in Park.
You stand in front with the hood open. Have them shift from Park to Reverse, and then Drive and back to Reverse and Park, taking time to stay in each gear and give some throttle while holding the brake pedal tight. This will rock or move the engine a certain amount as they shift through the gears and apply power lightly. It will move alot more violently with broken mounts.
If you have a clunking noise on Reverse shifts, you should be able reproduce this with the hood up and pinpoint the noise and/or sight the faulty motor mount with a friend's help. Good luck, I hope this puts you on the right track to fixing this annoying noise.