While searching for the elusive vacuum leak on my '84 4000q last night, I sprayed some WD40 (no silicones...I checked) around the fuel injectors and the engine sped up. Aha! It did this for each injector I tried. Does this mean those O-ring seals on the injector inserts are "tired"? Is this a do-it-yourself job? Thanks in advance, John Mallick '84 4000q '91 200q