'03 v6 Passat, AT, 80k miles - irregular rpms at idle
 

Hey all.

Love my passat, and haven't had a single issue with it, til now.

While waiting at a red I can feel the car move a little every few seconds. Looking at the tachometer needle I can see it is moving although I'm not touching the accelerator. Basically at idle (in drive) I'm at about 900rpms, but every 4-5 seconds it will suddenly drop to 800 and then shoot right back up to 900. If I change gears to park or neutral it still happens but it's much less noticeable.

I don't notice it at all while the car is moving.

My mechanic (whom I trust) can't explain why the rpms aren't steady. There are no fault codes. He thinks that maybe this has been happening for a while but it's only become noticeable now because my motor mounts have deteriorated to the point that the engine is moving, and thus moving the car.

:confused:

Just replacing worn mounts seems to be treating the symptom instead of addressing whatever the issue is.

Any ideas?

Thanks.

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