Before goiing through too much trouble, double check your spark plug wires to be sure they are on the proper terminal on the distributor cap. I have attached a picture of the diagram for the spark plugs. (Not sure which engine you have--let me know if your engine isn't on the diagram)
If the spark plugs wires are correct then it sounds like a blown head gasket. Have a compression check done on those two cylinder (all cylinders actually). You can sometimes rent a compression gauge from a local auto part store. (They will fully refund you money when you return the tool).
If possible, have a shop to do a cylinder leakage test on those cylinders if the compression test shows low compression. This test forces compressed air into the cylinder. In your case if the air comes out of the ajacent cylinder, it would indicate a blown head gasket, warped or cracked head.
Monday, April 1st, 2013 AT 2:24 AM