Check the turbo boost. If it is down, check hoses to the intercooler. On CR940 these have been known to leak around the joints. Put extra clamps on these hoses. Otherwise buy the next model up! There always has to be a limiting factor. Regards, Mick in Oz.
New Holland haven a program for fixning this problem. look for fuelpump. On the new CX840 for sson 2005 there is a cooler on the fuel line. And it helps