Rustproof, The fuel distributor it's self wouldn't cause a higher idle, but if the o ring seal under it is missing or deteriorated, that would affect the vacuum. The # for the Delorean fuel distributor is 0 438 100 109. Volvo's will work in most cases, but they to be pressure tested and flow tested for accuracy. I have listed some of the Volvo's and Porsches on my web site. John Hervey http://www.specialtauto.com/fuel-dist.shtml