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I assume you want instructions on how to put shims in or the process at least? well it's a complete guessing game. Try one, test, if not good enough move onto the next size. Keep going, and once it starts getting bad go back to the previous size and you're done.
Disconnect the battery and raise the car up and put jack stands under the front. From below the car disconnect the the wires on the solenoid connected to the starter. Remove the two bolts holding the starter on but remember the location of the shim under one of the bolts so you can put it back on there in the same place when you put the new starter on. This will work on the 2.5L and the 3.0L engines. If you have the 2.3 or 2.4 quad motor you need to remove the intake air duct,cooling fan, and the oil filter. You have to take the starter bolts out and pull the starter out enough to remove the wires. You have to remove the starter out from in between the manifold and the radiator.
when you take them out it's a good idea to keep them in a certian order that you will remember but im guessing that you didnt. its not really a big deal, just put them back in however it shouldnt hurt anything
If its the 3.1L it could be your intake manifold gasket , the material used for the gasket does not react well with GM's Dex-Cool antifreeze. The leak may not be apparent at first, but I would pressure test the cooling system. If you look at the front of the motor by the belts , try to peek down at the intake manifold and check for slight seapage to an obvious leak.
If its either of the Quad-4's they were notorious for heads warping or cracking.