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Water in engine-head gasket most likely.
NO, but a good tuneup will probably cure your problems. There is no cure in a can for the symptoms you list.
No
lifters
I have a 2001 Monte Carlo and mine started sputtering. It took me about a month to fix it but all I needed was a tune up....but all I did basically is change the spark plugs and wires out and now it runs great
4.2 quarts or 4.0 liters
1 - 3 - 4 - 2
Should be 1 bolt in each corner
i would check out the injector pump. it is a common problem with that model cummings.
spark pluggs
expansion tank at right side of firewall(driver side) under hood
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