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

hi all got a corsa club was driving it on the motorway and it was fine but when i was sitting at 70 the eml came on and it felt like it was missing kinda just let off slightly so i took foot of throttle light whent out so took it up to 70 light back on carried onto 75 still on then i pushed throttle right to floor and it went off kept coming on and off.
i have changed the spark plugs and oil very recently but i didnt gap the plugs would this be the problem or is it something like EGR valve or something
also i noticed sitting at 70 i could here like a whip[ or crack noise thats the only way i can explain it

does it tick over ok, or is it a bit lumpy?

it sounds ok i suppose

bump

bump

mine did something very similar to it

turned out to be the air sensor or summat playing up

took it to garage, 2 hours and 30 quid later it was sorted

was it oxygen sensor by any chance?