Hi dear I have a ford focus 06 1.8 Diesel. tow weeks ago I changed my flywheel and clutch is badly cracks now when I pull in traffic .i spoke with the same mechanic the one changed my car clutch and he told me the vacuum pump is leaking i chinged that asswill and still the same problem . My car have changed Dessel filter , glow plugs , and and full serves month ago I really don't know what to do for this matter any idea Please .

Thanks ?