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It's not the motor causing the problem,it's a poor earth connection.You can either run a seperate earth wire from the body of the motor to the engine body,or trace the earths in on of the footwells inside the car.
If you look at it post number 9 on this thread it should help you out.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo