Same thing happened to me a number of months ago, started up from dead cold to run the weekend errands and hit the throttle and just mush and shudder feathering the throttle to no avail. I thought I had finally cacked the trans in a big way, But i rolled down our hill to a turn out and was able to back up and inspect finding no apparent problems and no thrown codes. I was about to start thinking about the fuel and decided to wait for awhile and tried a couple of restarts, and about the third attempt the issue went away.There seems to be a lot of ghosts in the DCM software. Txs to gmctd for the 411 on the SGII incompatiability what a nightmare thats been !!!!!!!!!

I had a similar issue, I was on a road trip pulling a 3000LBS trailer and for the whole week of the trip when starting from a stop it would cut out and have no throttle response untill I floored it. Then it would cut back in hard and take off leaving a huge black soot cloud. Very odd. I plugged back in my off road mod and I haven't had this issue since that road trip. Also there was almost a turbo barking noise going on.

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66K
Jeep Liberty Limited CRD Silver
Front tow hooks, rock rails
Skids, lift, 235x85 Toyo Open country A/T
Glasspack Exhaust

You can still use the SGII as a scantool to look at various parameters, or check for DTC's - doesn't cause any errors at standstill, just not a good idea to use it while the vehicle is moving

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

If it were a timing issue there would be a lot of smoke, either white or black. I have had it happen twice. The first time it lit up the TPS mismatch light or whatever it is called. The second time, nothing, but same symptoms. My wife has had it happen to her but it always resolves by the time I get there.

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Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.