3
questions

Yesterday, I went to a mechanic to check the car, he told me you need to change the clutch disc and and the clutch disc plate,however the second day, I felt the car is shaking when I give the car first gear pressing clutch and gas pedal. then , I went to the mechanic, he told me you can try two days to give the disc and clutch flexibility to be get accustomed to work together with the flywheel. I don't trust this mechanic, knowing all pieces of change, are new.
your help is highly appreciated.

When I start ignition, I feel the engine is shaking and low and high noise.. i don't know where is the problem. at the same time when I drive and try to slow down the car, I feel the engine wants to die, and yesterday, I found the exhaust produce white smoke.. I don't know exactly what is the problem in my car??
Please your help is appreciated

This car was given to me. It runs great but the trans slip. People tell me it is the trans coumputer. I never heard of this. Can someone please tell me where is the trans computer?