How do I disable one fuel injector on a 1992 Cadillac El Dorado 4.9 V-8 so I can run engine without that cylinders spark plug. i need to do this so I can seal blown intake manifold gasket without starting fire in engine with fuel thats not ignited in cylinder, I dont need the pressure from power stroke forcing pressure through cylinder and unsealing repair until completely sealed and repaired? Thanks in advance in for your help!