Still have the same problem! Help!

Hello together I have always moch the problem that my bella in the lower DZ range (to approx. 3000) has no power and have the feeling that the too fat smell and the motor problems have to come on towers. if I speed up dan feels that someone is holding me and lats me at 3000. what could that be? no error stored, LMM new, lambda new, phase sensor new. gruss markus