Car judders in 1st and second gear when accelerating over 2k revs and will occasionally trip the management light.

Check this ,
http://www.datsc.com/tabid/122/OBD-Error-Code/P0641/Diagnostics/ford/Default.aspx

And this ,

http://www.justanswer.com/uk-ford/63n81-ford-fiesta-hi-codes-gearbox-help.html

Found this page with the fault code I have got p0641 could the pedal or throttle body have an interference and cause this problem to trip the management light and have the same symptoms? http://www.bba-reman.com/content.aspx?content=ford_fiesta_common_problems_and_solutions

Seems to cover earlier models .

" Ford Fiesta & Fusion upto 2003 1.25 1.4 1.6 Duratec "

Hi my local garage said I need a new ecu but since getting my car back after the ecu was tested and passed the test, it seems to run a little bit better. Do you think that this could be what I need (new ecu) They said to get a used one and to get it coded would be 300 plus. Any ideas?