Interesting comments. My first reaction is that we are talking about a load induced single cylinder misfire, but it could be a driveshaft vibration. These are obviously two vastly different senarios.

I tie my reaction to this statement: "And the shudder happens when i'm taking off the line, and it stops when i get to speed"

Taking off from the line would include time when there was no driveshaft rotation so I don't think in those terms. Need a further description.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician