I hope you did not buy a 112 153 53 79, because it is not the correct replacement for your car, as you said your car has a manual transmission. Read CL770 post and understand that a new or used replacement PCM must be programmed for your car with the correct VIN so that it can communicate with the SKREEM anti-theft ( demobilizer) which is located behind the instrument cluster. I had hoped the mechanic you are working with was able to do the programming as you had said your car was running good after he had placed a denoted PCM in your car. The keys/fob, SKREEM, PCM and the anti theft module in the trunk area all must work together as a unit for your car to work properly. The PCM is not a plug and play replaceable part.