I have a 97 Ram 1500 with a 5.9. A few months ago it started acting up. When I start it in the morning it will run for 10-15 minutes and then it shuts off (doesn't ALWAYS shut down). When it first started doing this you could start it back up about a minute later. Now it's taking 5 - not at all.
A couple times now it has just decided to not even start.
So yesterday I replaced the oil pressure sensor. Then the cap and rotor--both were badly burnt out. And I replaced the ignition coil. Truck still would crank but not start. This morning it fired right up And ran for 10 minutes and shut down. 5 minutes later it started again.
What do I do now!

 

First check for DTC's and pending DTC's, and if there are none test fuel pressure. Beyond that, it's troubleshooting time -- time to figure out if it's spark, fuel, or both going away.

 

I did the key dance and nothing comes up. Since it did start I'm going to head to O'Reillys and have them check it out tho.

 

X2! It could be a bad cam or crank sensor. They can go bad and not throw a code.

 

Had this problem on my 99, I replaced the crank sensor and still did the same thing....ended up being a bad Temperature Sensor