ObdII codes

Can anyone figure out this code... It's a 96XJ 4.0


P1391 Intermittent Loss of CMP or CKP
I am trying to figure out what the CMP and or CKP is..


Thanks
Dave

It can be a intermittent loss of either camshaft or crankshaft position sensor or no crank reference signal detected during engine cranking. The cam sensor is the pickup is the distributor. The wires can rub through at the motor mount bracket and cause problems. The crank sensor is on the transmission bell housing.

Thank you

I appreciate the help.



Dave