I bought a 1998 Grand Cherokee 5.9 Limited two weeks ago. The day before yesterday, it would crank but not start. There were no problems before that that I noticed, it came on suddenly. One day it ran great, the next it wouldn't start.
I swapped out the crankshaft position sensor, as all the research I did pointed to that as the main culprit, but it didn't help.
Then it seemed that the coil was getting spark, but not putting out a spark, so I swapped that out this morning and the Jeep still won't start! Any suggestions? Thank you in advance for any help!

 

Maybe Cam Position Sensor inside the distributor.

 

The coil should have 12V on one terminal, and the pulsed ground signal from the pcm on the other. he coil does not 'get spark' from anywhere.
Did you check the fuel pressure?

 

Did you read the codes?

 

Swap the cap and rotor, theyre cheap. Check all of the plug wires for a spark to ground while someone cranks the motor. And unfortunately, Dave is right. It could be the Cam sensor, Crank Sensor(you replaced), Timing sensor or timing itself could be bad. There are so many things that could be wrong here. You just need to get started, and check things off the list. Start with the obvious and the cheapest.

 

Also, the computer solder points. Had that issue on a friends.