I have a 2005 crd with above subject illness. Have had it to two different dealers and neither could solve the problem. We have replaced the EGR, MAF, MAP, cleaned and tested the injectors, cleaned and inspected the intercooler hoses, tried the orm and elephant hose and then went back to stock, and installed new air filter. None of the above helped the problem. Once you reach highway speed it runs like a striped a_____----- ape. HELP!!!!!!! Any suggestions anyone?

Try:
1. boost pressure solenoid bypass - viewtopic.php?f=98&t=64278&p=709322#p709322 - replace if needed.
2. check for proper movement of variable vane actuator rod - per GDE "You can check the vane functionality at idle in park. Underneath the vacuum actuator on the turbo is rod extending downward connected to the vane mechanism. If you pull off the vacuum line at the turbo, the arm should drop about 1/2 inch and then raise back up after reconnecting the vacuum line. It is a bit difficult to see the rod, but this is the easiest method to check for proper VGT vane movement." If not moving like it should you likely have sticky variable vanes. Usually 1 or more "italian" tuneups will fix this (on engine at operating temp do a full throttle run up a slight hill like an interstate on ramp grade)

Couple of other comments:
1. a noticeable turbo "lag" is common with the stock turbo - maybe 1/4-1/2 a second or so before the turbo kicks in.
2. "excessive" smoke varies between vehicles - normal smoke without a GDE tune looks like a gasser with really bad rings (darker of course) while truely excessive smoke begins to resemble a coal fired locomotive.
3. unrelated but have you a) read the NOOB guide and b) checked the airbox to turbo hose for a tear on the bottom just in front of the turbo?

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Haven't checked those areas will so. Sounds reasonable to me. Thanks for the info.

Found a tear in the connector hose where it attachs to the turbo. New one on order hopefully will solve problem. Thanks again for the info.