hi guys im new here i have a 2003 vectra 2.2 diesel and i buy it with airflow meter problem later i went to the mechanic to scan it and it was the air flow so i got a second hand from a friend car wish one him hv been crased im the back but the engine was working fine ...well my mechanic changed it then i went to test the car and it was the same at 60 miles ph the car light come on (the car with a spanner) and the car losse the power i back to the mechanic him scan it again and it shows egr valve him cheked the egr and she wasnt moving free and also the car was smoking a lot like a black dry smoke like a powder so him took it out and give a good clean put bck i drove it for test again and it was the at 60 miles cut off with the light ..back to him scan again and it shows airflow again but it wasnt smoke anymore so him tryed a lot of things and nothing solve the problem the car still the same till today and now some times the car dont even want to start the light (with the car with a locker come on and i call my mechanic him just took off one cable off the batery wait few mins put it back and the car started but somrtimes the car works verry funny stranger jumping like a frog so i went to another mechanic him has a big huge computer him hook up it on the car and it shows 15 erros codes (i will take with him all the codes and put here i dont hv it now) but i him called some other guy on gthe phone and told him abt the car and the guy says it is something with some memory i dont know where she was like broken because the other mechanics wasnt delet the faults codes ...but if someone can help me or hv some issue like this let me now i give a look at the vaccum pipes and i did not find air leak i took the pipe from the turbo out and spin the turbo it was movin fine free but i noticed oil on the pipes from intercooler i heard abt cat or pdf but i tryed to took the exhaust pipe out but i colud not due to no enough tools pls help me