I have a really big problem, can someone help me ????

Hello together ! I have a big problem with my Audi 80 B4 Avant bj.93 2,0 E ! It is easy for me the ride would have gone out and since it makes it fully mute. it runs up to 3000 U on three pötten, so it sounds at any case. Spark plugs I have made new clean still the same problem, because the cable from the ignition. to the distributor cap not looked so good I have made it even more clean, same problem still. if I let the gas go he falls on so about 400- 600 U and clacks. has someone an idea what that can be. ??? I would be grateful for every tip.!!!! LG Mike