Hi all..i have assista 121 5 model 12 registered. .i n facibg a problem..when i turn on ac and put the car in gear it start shaking..i went to a lot of mechanics. .some says that engine is week other says its electrical problem .i already did tuning.cables and plugs are chabged ..i m really tired of thia problem..can anybody guide me...pllzzzzzzzz