Engine problems Sd

Hello together I have a problem with my Audi 80 1,9 l 113 ps sd Bj 88 K-Jettonik ! And I had removed the ignition rinse to check if everything is in order after which I could not detect any error I have installed everything again as it was but now the engine is totally restless and squeaking at the back extremely start ! The spark plugs are wet from the fuel or totally rusty ! have had nothing changed on the engine and 30 min before it ran still flawless ! Where could the error jet zt liegen ?? Furthermore, I have a problem to come on despeed ! That means at about 180 km/h nothing comes anymore although the engine is new and has been completely revised ! What is this?? Hope you can help me Thanks mfg Matze