Silly question really BUT, as someone said earlier about the air filter being bunged up with muck.Only on the fiat ducato Richard. The wastegate on the iveco is nothing like it unfortunately. So you can't do the spanner trick. I had to constantly free the one off on the euramobil . The iveco turbo etc is twice the size of the fiat . It's a big mither
Have you tried running it without one to see if there was any improvement?