Thanks for the reply. I tried changing the right engine mount thinking that was the cause (the car is a little jumpy on the right side when running). It did stop the vibration a bit but not totally. The old mount looks 'soft' as compared to the new one probably because of the shaking it endured. Aside from that it seemed to look alright. As to the low pressure fault, I changed the fuel regulating valve, now fault is gone. Now I'm thinking that the vibration might be caused by faulty injector causing one of the cylinders not to fire. There is also an associated noise from engine that is why I thought this is the cause. Funny thing is, the rpm looks stable on idle, wouldn't it fluctuate when one cylinder is not firing? Anyone?