I replaced intake manifold gaskets. Now engine races at idle from low to high RPM at about 1 second intervals. I checked vacuum lines for leaks. I disconnected sensors one at a time and in groups to see the effect. Little to no effect on Rep Rate or RPM. Would swapped wiring to injectors cause such a problem. I thought I wired them correctly but the wire colors dont match the schematic I have. PS this is a 3400 SFI engine.