My Ford Fusion (diesel) runs like a tractor when it's cold in the morning. After getting warmer will get jerks and knocks at some intervals. Often at about 2000 rpm. After more than an hour driving comes jerking and knocking tighter and then tapping and jerking is strong and finally the engine brakes in and dies. After long cooling it can run again after which everything is repeated.
The Ford workshop does not find the fault but has replaced the glow plugs and injector cables.
No fault code for injectors is given.
Could it be the ERG valve?