No spark

Then you must have a fuse blown in the PSi fuse block or you might not have correctly wired 12v to one of the wires necessary. If I remember correctly, there is a red wire that requires positive all the time and another wire that is specific to the fuel pump. Since it doesn't fire and die quickly, the fuel pump relay is probably wired correctly. The thick red supply wire may not be. Double check this wire. I think it goes directly to one of the relays. I'm relying on memory so hopefully I'm remembering all this correctly.

It should be terminal 85 on the relay opposite of the fuel pump.

I checked that and it's working on key on and cranking. Think maybe the volts being low might of been it. I'll test it in a hour again

Volts drop down to under 10 while cracking. Not sure what the problem is ahhh

I think that'd be fine to start it. Was VATS disabled?

Where are you measuring that voltage drop at?

At the red wire that comes off the fuse box also another hot wire. I bought the harness from a forum member maybe they weren't deleted. I'll call PSI Monday

VATS delete is in the tune, not the harness. If it is not deleted, it will start and run briefly.

Don

Sorry I meant ECU and Harness

If you hooked up the 12 volt switched to the original wire that runs to the coil and it was older style points ignition the coil wire will have a resistor built limiting voltage during run.

I've never heard of a brake light switch wired to the ECM when using a manual trans that would prevent it from starting. Only time I've seen it was to make the reverse lock out work like stock.

Try wiring the switched 12 volt to 12 volt constant just temporarily to see if it will fire. If it does disconnecting the wire will shut the computer down and shut off the engine.

From what I've read a bad cam sensor will not shut the engine down but a bad crank sensor will.