The 3.8 is notorious for upper and lower intake leaks my advice is to change lower gaskets on intake and replace plenum and gaskets before it leaks so bad that it hydro locks the motor like mine did,good luck

My 1997 Bonneville SE has had a lose of power for along time,after replacing plugs,wires,sensors,cat..converter,fuel filter,nothing helped the lose of power and spark knock after countless hours searching for solution on forums was suggestions that i listed,here was the fix for my problem, I pulled ...