I picked up this car a few weeks ago and I am pretty confident it is either having clutch or transmission problems. Within the first 5-10 minutes of starting the car it will barely go into gear. Also, when taking off from a stop, the car bucks and feels like the clutch is slipping really bad, however while stopped and with the clutch engaged, the car will not roll forward at all. Never owned an LS1 car before this so I can't accurately tell if it is the clutch or transmission, however any advice would be greatly appreciated.

 

most likley your clutch.

 

Yeah thats what i am thinking....

 

Try bleeding the system and see if there is any improvement.