Acceleration problem
 

Hi there,

I have an Audi 80 1.8 S, and I am experiencing a problem with acceleration.
Whenever I rapidly or even gently hit the gas pedal, car won't accelerate immediately. It takes two or three seconds until it starts accelerating. In general I noticed that it does not accelerate as it use to.
Alsooil lamp goes on and off occasionally so I am wandering what this could be.

Thanks in advance.