Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

my beloved 1.0 12v S reg corsa had problems about 2 weeks now its been in the garage it started backfiring one morning and wouldnt start an then it would cut its self out it eventually started it got me to work and it went to the garage next door they changed the spark plugs and the EGR (Exhaust Gas Relay) valve it starts it goes alot better along flat road but when you go up a hill it struggles and is losing power, the garage took the computer out an took it up the hill and about five codes came up they took the ECU out and it got sent off to be checked it came back and there was no problem with the ECU so if anyone has had the same sort of problem please please help me i miss her so badly i want her back and before anyone ask yes there is petrol in the tank so please help?

what 5 codes did it come up with?

i don't know which ones the garage next to me are doin it they said the lamdda sensor came up and and went off and the airflow meter but the car is operating fine on the straight just not up hills they said it struggles thats as much as iknow i was wondering if anyone has had the same problem or something similiar so instead of changing all the sensors an costing me a arm or a leg and help me to change the one please?