The vehicle has little or no response to the throttle pedal when pulling away, once it has moved off power then picks up and it drives normally.
The car is an auto and pulling out of junctions can be a nightmare.
The P2279 code "Intake air system leak detected" led me to smoke test the intake and a split hose was found and replaced. No improvement.
The EGR was removed and found to be jammed open with carbon. As I couldn't clean it sufficiently well a new genuine one was fitted.
The MAP sensor was dirty and was cleaned.
The MAF appears to correlate with expected values but a MAF reset was performed anyway.
When driving the P2279 does not return but as the DPF is about 60% loaded I attempted a forced regen it failed and the P2279 code is logged again.DPF back pressure (from memory) was about 8kPa at a steady 60mph.
Something I have not addressed yet is that the engine runs excessively cool, about 60deg C and I suspect the thermostat, I can't see how this would affect throttle response though.
APP values are as expected and I also checked the UEC for water ingress/damage.
The car was originally a Motability car and also a Cat-D with damage repairs to front nearside, to cap it all it was bought for use as a private hire car!
Perhaps I'm missing something simple.
Shaun.