So this just started happening out of the blue (no recent maintenance). Seems to crank and start normally, but dies within a second or so. Fuel pressure good (steady mid-30's psi), and timing light seems to keep flashing as the engine dies.
Have done a lot of Cruiser54's Tips (grounds, etc)

So far I've checked
CPS - resistance good, good voltage while cranking;
TPS - good voltage while throttle shut and smooth thru range
MAP - checks out okay
Dist speed signal - wavers around 5v while cranking

Seems like maybe something is killing injection after first rev? Feathering or changing throttle position doesn't seem to affect anything, it WILL start after 10 or so minutes - about the time I think my battery is going to give up on me. After I do get it running, it seems to start just fine when hot.

Runs normal when I CAN get it to start...

Thoughts? If I can find the signal that is getting lost, then maybe I can determine the bad sensor/wire...?

Thanks in advance,
Mike D.
89 XJ Laredo 4.0 Auto