L200 Trojan 2010 model ..NEED HELP
 

HI guys I have a 2010 L200 Trojan twin cab purchased from new. All the services done at garage etc etc. For a while when in 2-3-4th gear and speedo is at 30 or 40 mph or sometimes even 80 the car splutters quickly then ok when I press the accelerator that little bit more. The car has had a new fuel pump, didn't make a difference, nothing showing up on Computer check by garage.
i read or was told by someone to check a small air intake type thing deep down in engin.....not expensive to buy etc etc but a common fault with make and model and does not get picked up on checks..aaaaaaaaaahhhhhhh

Can anybody help with this issue and maybe point me in the direction of such a device to replace possible faulty one ....am desperate as garages over here in Germany don't know what I'm trying to explain.

thanks