This Corsa has given the owner grief for a long time now however the latest problem is poor idle and stalling and performance when cold. Car starts ok now since the heater plugs were renewed but stalls easily unless you give it some throttle, seems to be mainly ok after fully warmed up. The only code it gave today was P1216(rail leak or rail pressure control valve malfunction) or another description I found is "fuel solenoid response time too slow".
I monitored the scanner readings from cold and found that desired fuel pressure and actual fuel pressure were the same and readings from pedal sensor, coolant etc were all good at all times. I should add that it has recently had a new air mass meter(genuine Bosch)and EGR valve.
I wondered about EGR readings which seem to be different to a petrol engine, I got at idle when cold"EGR Position command 34% EGR Position feedback 4.00volts EGR pulse ratio o%"
I have had a look throught the Vauxhall TIS 2000 and found nothing of interest, not much info on Autodata, Tolerance or Vivid, wondering wht next step might be, thanks, Jim.