hi.here goes another one..my friend has a hymer motorhome and its on a 410 engine 1988,,k reg I think...its fine on the flat but slow on the hills.never used to be,compression checked,injectors changed..can any one help or suggest things to look at...my friends mechanic has been looking after his vans for years and is lost at this one.any help would be greatful.cheers.....ps...has anyone converted a s700 hymer engine into a sprinter...can it be done and does anyone know where..just an option if they cant fix the 410