Hife!!!! Cross handlebars changed -> when load changes noise!

Hi, at our 2.2TiD, after 160tkm, the carrying joints were peeled out => new crossbars. Nicely ordered and installed new at the beginning with the parts salesman for Volvo and Saab with S. Everything was nice and good. After a few kilometers it started to give a clone (as if something is stuck, then moves) and also accelerate in the 1st course. It was getting stronger and stronger up to every light brake and gas there was! Have removed everything again today and reinstalled again and is still there. Can anyone help me???. Greetings Raphael