Thanks all for your indulgence.
Corsa 1000 t reg
My lads Corsa tries to cut out if he puts his foot down a bit at about 40 mph engine just drones and car slows until he backs off the pedal
It seems that following a TECH2 CHECK he actually had not only the EGR Valve replaced but also the " Idle Air Valve " replaced.
Anthony Britt mentioned earlier "The throttle stepper motor" ( i will check this )
Any other suggestions Appreciated TIA Capstick.(Baffled)