Vibration at 3000 rpm

[Foxbody93]

I just got my car inspected and it needed emissions, meaning they had to put it on the dyno. Since then I’ve noticed that at or around 3000 RPM I feel a vibration. This wasn’t there before the inspection. Did the tech f**k up my car? Any ideas?

 

[93 LX]

3000 rpms meaning stationary? bad harmonic balancer I would say

 

[2000xp8]

You need to give more details.
Car moving or not?
If it's moving, does it happen in gear and out of gear coasting?

Things that usually cause vibration:
Tire balancing
Bad alignment
Bad U joints
Unbalanced driveshaft
balancer (usually pretty violent when a balancer goes)
worn out flywheel

Use common sense when trying to figure it out.
For example, you know it can't be the driveshaft if the car is not moving.

 

[Foxbody93]

No vibration when the car is moving with the clutch in. I did notice a slight vibration when reving the engine to 3k. But it is most noticable when the clutch is engadge and I am accelerating. The car idles fine. I pulled the sparke plugs and they look good (no oil or anti-freeze). I wonder if it is the clucth or pressure plate? However there is no slipping of the clutch when I accelerate. Again the car was fine until the tech ran it on the Dyno.

 

[93 LX]

check motor mounts, tranny mounts