Hard to start and no power when accelerating

Hard to start and no power when accelerating I have a 05 audi a4 1.8 Quattro and it doese’t start usually until the 3rd or 4th crank and when it does start it has no power from take off and i mean its scary to pull out on the main road from take off but does run a little better on the highway but still dont have the power it should. What could this be