Hey e30boise, thanks for the reply! I figuret out what was wrong with my e30. The was a few things actually
I don't know what its called in english, but the thing on top of the engine, that measures the amount of air that gets into the engine, was from a 525! The result of that, was wrong air/fuel ratio! The sparkplugs where wrong, and there for didn't ignite the fuel properly!!! Then it needed some fine tuning on the computer, but now it runs like a charm!!!