Corsa problem

Greetings:

I get a customer explaining that the car goes out on top of 100 km/h and starts again without problem immediately after having turned off, the car is not thrown (jalonea), does not contain codes, (spark plugs, filters, ignition cables all new) the discarded gasoline pump. In Ciudad it works well but on the road the failure begins only above 100 km/h.

Someone has had the same fault or some idea of ​​why, the car is a 1.8 liter corsa 2003.

I await your answers, thank you very much

Hello, did you look at the catalyst is not covered?

Greetings:

It is not the catalyst, please someone who has another opinion.

Thank you