I need help BAD! SOMEBODY?
I think I might have a blown head gasket in my 94 seville!

It's missing and puttering rough. I found oil in the 3 or 8 cylinder after replacing the spark plugs,
Plus the Catalytic converter was smoking and smelling and the engine and exhaust seemed to have a pop sound.

What is all this and what can I do?
Thanks

Dan

So far does not sound like headgaskets - that usually involves overheating with increasing frequency. Any coolant loss? You could have a plugged catalytic converter or a few othe maladies. Pull codes:

http://www.cadillacforums.com/forums/cadillac-tech-tips/55172-how-pull-codes-got-codes-warning.html

The oil was probably sitting in the spark plug well, which is a slow weep from the valve cover O-ring seals at each well.

The sputtering and popping started after you did the plugs, right?

The 4-coil waste spark system requires that the correct plugs/wires go to the correct studs on each coil.