I have a 1990 305 Silverado with tbi. Only the green and white wires will power either injector. The truck will barely run on either injector. I have checked the red and blue wires plug, contacts and inspected them for insulation issues all the way to the firewall where it goes through to the ecm. Is there anything that would kill just the red and blue wires? My distributor was replaced two months ago complete with module and p/u coil. Could either one of those parts take out just one injector feed?