Once you undo the fastening clips you should be able to pull them right out. It's easier said than done, you can twist them too but make sure you only pull them straight. I am not very familiar with that engine but I know the GM 3.8 engine is also famous for the upper intake to crack and leak coolant into the intake, maybe look into a modified upper plenum while you have it apart. Dorman might make it. Good Luck!
Thursday, July 7th, 2011 AT 3:20 AM