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I'm pretty sure that a vibration at 3000 RPM is the front engine mount. I replaced mine and it largely fixed the problem. I say largely because it is still slightly there, but I discovered that I put my mount in upside down. Why?
(...Going from memory, it's been a couple of years since I replaced this...)
The original 986 mount that I took out was clearly shot. When I went to our host to by a replacement I discovered that the 986 mount has been replaced by the 987 mount. Great. I ordered mine and installed it aligned the same way as the original and the problem was massively improved. But still with a slight resonance at 3000 RPM.
Looking again, I discovered that there is an alignment notch cut into the outer tube of the mount, which should align with the bracket on the engine. It looks like the 987 mount is installed rotated 180 degrees from how the 986 mount was mounted.
Think of it as a circular tube with a thick rubber insert shaped like an "A" installed. The 986 mount had the "A" installed this way: ^
The 987 mount was marked to have the A installed this way: V
I've never gone back to fix it since it's a minor annoyance. I doubt most people would even notice. But one day if I'm in there, I'll flip it over.
The cost of the mount isn't alot -- so don't sweat the scare stories about the dual mass clutch. If you're careful, you can even replace the mount without draining the coolent system and removing the coolent hoses which are near the mount.
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