head gaskets

2004 Buick LeSabre Custom 3.4 L 3800 - 110K miles I started noticing some rough idling after seeing my check engine light come on. I ran the code and cyl 3 misfire showed. I changed wires and plugs and then got the same code again. I swapped coil pack 2-3 with 3-6 and same cyl 3 was misfiring...

Hello thanks for reading. I need help with my 98 Buick century v6 3.1 engine approximately 150xxx miles on her. First off, i had the inevitable lower intake gasket leak.. I had a friend replace it for me but he did a horrible job to say the least(he didn't torque anything!) When starting the...