Fiat Brava 1996 16 V 3.Cylinder is not running???

Hello people!!! I own a Fiat-Brava 90 hp petrol 16 V Built:1996 160 000tkm. On Friday I drove with it highway and after about 50 km drive, I noticed that the engine was running at once completely restless and total vibrations could be felt and also the gas was not accepted properly. I went out at the next exit and put myself in a parking lot. After a short time the engine went out. Trying to start again however runs completely bad when starting or without gas he leaves sic h almost no longer start. To drive absolutely impossible has no power at all and runs completely restless. So I don’t want to drive so much more as I don’t want to break myself anymore. What I have already found out is that the pins are ok but the 3rd cylinder doesn’t run with me… Can someone please help me, since I don’t have any experience with engines