I have a 1999 Buick lessee custom. try to figure out what wrong with it. one morning cane outside and crank it up. it crank up good and then 10 minutes later it start missing and then a cloud of white
Sounds like the intake manifold gaskets. The 3.8L V6 is notorious for intake manifold gasket failure. It will not be the head gaskets. The 3.8s rarely, if ever, blow a head gasket! HTH. - Jim
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