Seat alhambra 1.9tdi, 2002, auto - rough running at lower speeds - kml

hi,

I am experiencing very rough runs at lower speeds. Hesitates to accelerate / change gear . Consumes a lot more fuel than earlier. There is a terrible smell from the exhaust gases which is now very bad.

At higher speeds say 50km/hr up and higher revs 2000+rpms up then the engines feels better. There are no fault indicators showing at all.

i will be visiting the garage next week to discuss with them, if there are any issues i should look at please advise.

thanks