Ok, This isn't on my car, but on a friend's car. When a car blows blue smoke that means it's burning oil which means could mean a few things...

Blown head gasket?
Cracked Piston?
Anything else?

Anyone ever heard of a plug not firing to be causing that type of problem? Also gas is sputtering out of the tail pipe in small proportions. Any ideas??

 

worn valve guides, worn piston rings

 

or just bad spark plug tube seals... start with little thigns like that first... check the plugs and see how badly they are fouled and the head where it sits