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From my Audi days, we always called it turbo lag. Lag is what I have experienced once with this Liberty. Luckily, I was not going through an intersection and did not have anyone following me. I was leaving a friends house, going down hill. When I stepped on the accelerator, it died and had no power so I let off the accelerator and coasted for a few seconds and it eventually straightened out. I was able to then accelerate normally without shutting the engine off. I'm sure it was an air in the fuel problem, but it felt exactly like the turbo lag in my Audi.
No it isn't turbo lag but yes the CRD does do that too. Mash the throttle hard and nothing, feather it and it goes like h*ll.
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Just the other day I had stopped to pick some one up. After leaving their house the next hill I attempted to go up on a small side street showed that something was wrong. It was if the turbo was making no boost. It wasn't running ruff, but as soon as you tried to accelerate nothing. I was able to make it to a AutoZone a couple of blocks away. I shut off and then had them try to pull any codes and nothing. When I started it back up it ran fine and was then making boost. My ESP light was on. I drove a couple of blocks and shut off again. After restarting this time no lights and everything was working fine. This was maybe a month ago and it hasn't happened again.
Nope I don't think that is it either. Seems to me that I have seen a few post about something similar and as I recall it is an error in the traction control system. You may have slipped your wheels a little and the system tried to cotrol what it thought was a skid by applying brakes and/or reducing throttle. If you were trying to add throttle while it was trying to reduce it it probably really got confused.

Your ESP light here is the key.
FUEL STALL occurred once with me in heavy traffic with about 1/4 tank of fuel on a hot day after driving start and stop through town for 10 miles. I made a rt turn onto a new street and as I tried to accellerate ther was nothing there. Probably couldn't get it up past 10 MPH, motor was rough, had over 3K RPM and absolutely no power. Also no codes. When I was finally able to get to the right and pull off a shut down, wait, and restart cleared it. NO CODES!