I have had various problems with my landy the worst being an engine run on which blew the turbo, had that replaced along with the radiator, new clutch, changed the crank case filter for the BMW one...so all was well until a few days ago, I was cruising at around 65 mph when the power seemed to drop off for a few seconds just like if I lifted my foot of the pedal, and then a few days later around 50mph the same happened for a few seconds again. Not sure what is causing this has anybody got an idea of what it could possibly be, I removed the EGR valve which was blocked in carbon and refitted when it was nice and clean and I have replaced the air filter, turbo filter, and have put silicon hoses at the front. Any help would be appreciated.