I have a 87 gxl with s4 to s5 swap all sensors are still s4. I just got it put together and missed a primary injector plug so I would run but not idle. I took it apart and plugged that in better and started it. It ran perfect until I acidenatally killed it. Now it will not start tried deflooding and found no spark to leading plugs. OHM checked coil and cas both ok. Power to igniter and wire to cpu ok. Are there any tests for igniter or anything further I can do before I start replacing parts? Can the cas fail without killing trailing coils (They have a good spark). Any help would be apreciated.

when that happened to me, it was fouled spark plugs. the leading plugs are on the same circuit, so if one is fouled, neither fires

well, in all cases... replace them.

Thanks for advice it ended up being the leading coil pack, Thanks