56 Plate Mondeo ST TDCI having problems cutting out.
The car seems to drive perfectly fine under all conditions other than extreme load.
1st-3rd gears runs all the way to redline fine. 4th/5th if overtaking goes into limp home or cuts out completely at 3K rpm. This also occurs when towing the caravan, when under load, usually trying to maintain speed uphill.
Sometimes there's no error code, others we get P0251, Cam/Rotor/Injector fault.
Had a new fuel filter and EGR fitted (the car did keep faulting on EGR, and as it's been blanked off for 30,000 miles I knew it couldn't be this, but replaced anyway, and is still blanked off)
Injectors have been leak tested and come back OK, although it looks like one of them has a small deposit of fuel on top.
Anyone any further ideas before I start replacing expensive parts needlessly?