Bad Fuel Consumption

[big boy stevie]

hi guys looking for some help on my bus its a long time since ive posted on here, just had mot on her and the emissions were high bit of a weird one ok when ticking over lambada all good readings fine when reved goes quite high on emissions, now plugs are new and air filter and ive used redex quite regular aswell im told the ecu controls the fuel do i need to have this reset as its gone out of sync or is there something else i can try i dont want to go somewhere and they plug it onto some computer and i pay

[zorgman]

the lambda could be starting to fail but there a heavy bus and 2.3 not the best on petrol just lift foot a bit off pedal, best tip is try not to let car tickover ie put seatbelt on and wait till everyone is in car then start and pull away