will read through the thread!, just posted a thread about my maf ? hoping & clutching at straws!, Yours is like my vectra cdti, it was driving me mad! i ran a tin of bg244 to a tank full & it ran Perfect till i filled my next tank! so i swapped 2 injectors to prove it was not elec fault (inj easy swap with cdti's), so it returned to normal & the bad readings moved with the injectors so done 2 recons & all ok but trouble is when your trying so much you forget every little bit & all of a sudden its solved & your not quite 100% sure what exactly cured it!. the vectra had rough/chug with blue'ish smoke (didnt look a diesel prob with blue smoke) but its actually unburnt or incorrect injection, it could well be wiring or sensor related though?.