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Thanks for the prompt response .Inreply to your suggestions-Fuel pump pressure10psi-flow is ample.Timing with timing light-at idle going up to25-28 degrees before TDC before at 3000rpm If the vacumn pipe is removed at idle it moves to 15 before TDC.We have checked thoroughlyfor air leaks The missing happens only on hard acceleration between 1500 and 2000 rpm under load ie when passing The COs read 6% at idle but drop to 1% if the throttle is floored If it is released they jump back up to 6% at any speed I understand there is a govenor built into the injector pump to enrich the fuel under acceleration - it has to be set by a specialist The Bosch agent checked the pump but said it was working OK but would not have ckecked the govenor If we cannot sort the problem I will consider electronic but at this stage i want to keep it original I will be away 4days so cannot answer your reply
have downloaded the website you recommended-Will see how we get on