emmission

Smoke emission.So when going up hill black smoke,car tends to surge,foot down surge goes,but plenty of smoke behind,all filters have been changed,car still returns aprox 40MPG + on a run,thinking is MAP Sensor or the Air Flow Sensor.on the level road no problems.:doh:

Anyone knows where in Scotland I could do a CO2 emission test for a diesel? The MOT only do petrol car CO2 test and only smoke test on the diesel. It need to be somewhere specialized on this. Anyone has an idea? Thank you. Olivier