MKL after head seal change. Help!!!

The following problem makes me crazy… I recently made head gasket with nem Omega B 2,0 16V… Everything worked great.. also jumped immediately! And where he then slowly got temperature MKL… more restless run and when starting it goes out (automatic) He also does not drive faster than 140km/h and also has little power. Is probably due to the emergency program of the SG. Error memory told me intake air temperature sensor, (error 71) and NW sensor (error 92) Everything nice and good.. but this is not always so… while driving the MKL is sometimes off, when restarting again… Does someone have experience with this problem? Need urgent help!!!