Insignia b mk2 a misfire judder when pedal flat to floor

Hi guys I bought a mk2 insignia 1.5 turbo petrol it’s only done 19000 miles. When I want to give it some and speed of fast, when the throttle pedal is flat to the floor it sort of misfires judders not always but it’s really bad at different speeds and gears. Last time it did it engine light started to flash as was very juddering and went off after 1 minute. It drives fine runs fine but when the pedal is that to the floor and you’re going for it it does it. Really not sure if it’s something Vauxhall have but in for safety or is it the traction control does not feel like it . Anyways just seeing if any one else has had this issue many thanks Sam