jeep starts but after a while itll die.

93' xj 4.0L bought it with a bad distrubitor, replaced that, it wouldnt start so i put in a junkyard IAC and TPS sensor, it started and ran fine until i drove it around town and it warmed up then it acted funny and permanately died. now itll start if i gas it up past 1000 rpm or so then itll die shortly after starting. it does this over and over so now im stumped, the coil spark seems a little weak its white not really blue. could this cause this?

This would likely be the CKP. Many, many write-ups on this.

i already put a crankcase position sensor in, many, many days ago. so dont act like i aint read up.

I didn't mean to "act like you aint read up". Please don't take it personally. I'm just surprised that you didn't mention that you replaced it. I suck at long distance mind reading.

Yes, a weak spark COULD cause your problem.

Coil can be tested for primary/secondary resistance. Your junkyard throttle position sensor is a wildcard here too. They can be tested as well.

i read up on that testing of the coil but didnt understand exactly where to probe.