hi this prob just started and not sure what it would be i went on a long drive and on the way i noticed every now and then the boost would cut off and then the check engine light comes on if i keep the acclerator down i have checks the pipes and there seems to be no leaks

could it be the computer coz i can turn off engine then start it again and its sweet for a while then cuts off again

any help would be good

If there are no leaks in the exhaust running up to the turbos, then check for a clogged cat convertor, that will cause excess back pressure on the turbos' impeller blades causing them to slow down from the resistance, this will cause a reduction in boost. If you live in an area that does not require emissions checks, you may want to either guts the cats, of get a catless down pipe.

Pull the codes from the engine. More then likely that will give you a clue as to what the problem is.