Felicia shaking

Hello Everybody ,

First I would like to appologize for my bad english,now the problem

I have a Skoda felicia 99 MPI 1.3 engine and for a couple of days the engine is shaking, trembeling,and vibrating not like usually , I have checked the mountings and they are ok,

it is like I am having a diesel engine or maybe some of you know the Trabant cars engine sound,this is how it sounds,

and there is also a power loss(this is my feeling), also my impression is that the engine is not working round it's like working on 3 or two pistons. plus I have floored the gas pedal and the car is going faster as it should go , Ihave to wait for a while to build speed

I am waiting for your replies ,

Thanks a lot.