What is the crush gasket used for in the lower manifold? is it to line up the lower gaskets with the lower manifold ?
I am going to do the job this weekend ,any help or pictures would be great.thanks in advance
The crush-washer is attached to the plastic gasket for the lower intake manifold so that it does not get ruined when your torque down the manifold. Mine was so badly deteriorated in some places it was literally falling apart. I hear this is more common in areas that have ethanol in their gasoline. Here is California, that's all you can get now.
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There is a good step by step tutorial on this site to review:
HERE. Granted, it may not be specific to your truck. I didn't take much pictures. As I recommended before, spray some lubricant on all bolts in advance to make the job easier. Also, change the distributor cap and rotor, fuel regulator, the vacuum line from the fuel regulator, and possibly the injectors if they are leaking or are giving you problems.