My 2006 Liberty just stalls and then restarts it is a crd

Check for a frayed wire behind the fuel head filter.... It a well known issue with the 2006 CRD. The wire harness behind the fuel heal filter assembly gets cut being in tight quarters...... Chaffed wires.

Inspect wire harness behind fuel head.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

What racertracer said^^^

Also this is a typical symptom of a clogged fuel filter or air in the filter head....try priming the filter head.

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2002 Export CRD 2.5 Sport

If not a fuel or wiring harness problem as stated above, probably the crank sensor, they are notorious for intermittent operation during the motor warm up cycle. It will stop the motor and in most cases give no codes (DTC), and then will allow a restart until the next time it quits functioning properly again....

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve