i hav a astra 1.9 cdti 150. i hav put a eco 3 green tuning box's on it. Its great until i put my foot down around 90-110mph it alway go's into limp mode. it been in and out of vauxhall and they never seem 2 fix it because. i hav warranty on it i always hav 2 take the eco 3 box off when i take it in. so they dont seem find the problem. it is fine when the box is off but when it is on its always in limp mode. any ideas?