1995 c280 wiring harness problems

hi guys please help. i purchased my 1995 c280 january 16,2002. i have had this car in the shop 4 times (which is in the shop as i type) i have all 3 coils replaced and it still am having the same problems i have today been informed it is the wiring harness and has been all along. please help i can not afford to keep taking this car back to shop or to replace this harness at my expense since it has been a problem since day 1. has there been a recall on this or is there anything you can do to help me.

thanks,
shirrel