Thank you to Peter AND Trevor, I have done a basic on my fault by removing a few connecters and spraying with WD 40. guess what, did another test and bingo no faults recorded. on a small run appears to be fine. now accelerates above the 2.5k/rpm. so hopefully recovered. Thanks for your help, its nice to know there is some one to turn to out there that doesn't want hundreds of pounds to help. Regards Stan