I really need help with this one. I have a very disturbing vibration that seems to be generating from the engine @ 1,600 rpm again at 2,200 rpm again at 3600rpm. It feels like it is coming from the drive train but when I disengage the clutch it stops. I can produce it sitting still and slowly bringing up the rpm to thise levels. I am getting ready to do some tuning this week, I know that the car is running lean. Check my profile to see what mods I am using. The car performs perfectly. No loss in power, no smoke, good gas mileage, no overheating. Runs like a scalded dog! Checked the motor mounts and they are fine. Could it be the clutch / flywheel area? My mechanic is stumped, the dealer hasn't a clue. My car is a 98 coupe.
