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i take it its a 3.1, i did this job a couple months ago, the reason for over heating, did you flush the old gunk out of coolant system, when you were done replacing gaskets. what i did was flush out system, and replaced thermostat while doing intake gaskets. no problem so far!!! as for the roughness it could be anything. but the number 1 problem is a vaccum leak, or fuel injectors are leaking into cylinder making it over rich mixture.

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Q: Your daughter has a 1999 Malibu you have changed the intake gaskets and It is overheating It is also running a little rough Any ideas?
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