New stepper motor don't work

[neale]

I have a Saxo 1.1 standard engine
It has been running badly so I had a diagnostic done and was advised to replace the Stepper motor which i did with a brand new one.
It ran fine for four days (about 100 miles) then started this awfull kangarooing....PLEASE HELP!!! what do I do next, is something blowing up the stepper motor?

[Mark51]

might be the coil pack mate. i think its time to get it plugged in to the diagnostic again and see whats wrong with it rather than guessing at what it could be.

tell them that you have replaced what they told you it was and its not worked so you want the diagnostic for free this time