Has anyone had a problem with their intake manifold gasket. Mine some how has blown. What causes this and what gaskets do i need? The upper or the lower or both.And what else do I need to replace.

Yeah, I think everyone with a 3.1 or 3.4 has had to replace their intake gasket. The combination of being a terrible design and the expansion/contraction of the intake and heads is what makes them go bad. You should be able to purchase a kit that will have everything in it you need to replace, such as o-rings for the injectors and a TB gasket, etc.

Has anyone had a problem with their intake manifold gasket. Mine some how has blown. What causes this and what gaskets do i need? The upper or the lower or both.And what else do I need to replace.

I just had a prob with my intake Gasket There are 2 kinds for 3.1
1 that is for pushrod guides and 1s without
the push guided 1s are a bitch BUT you can CUT the gasket
to go around the Push rods
This Kit will come with upper and lower intake gasket
Cost $35.00 @ Advanced auto
PS CAREFULL WITH THE GAS LINE WIEN YOU REMOVE IT DONT LOSE
THE RUBBER SEAL

real common prob with both motors. 3.4 is really delicate. Just follow all the instructions closely when replacing.