very difficult to determine your problem,have you had a code reader on it?You could go on and on renewing parts and get nowhere but an empty bank balance,it would help if you could go to a scrappy and would save you money on parts,the dual mass flywheels are bad for going on these and just wondering if your crank sensor has been damaged,check for fuel pipes rubbing through in engine compartment also,is the fuel tank vented ok?filters nice and clean,these are cheap fixes and would start there before renewing expensive parts
cdc
February 2012