Usually, when you have two adjacent cylinders with low compression, it indicates a possible blown head gasket. Are you mysteriously losing any coolant?
If you check your dipstick, does it look muddy?
You may consider doing a coolant pressure test, which involves a hand pump that fits over the radiator cap opening. Basically, you manually pump it (engine off, of course) until you get 15psi. Then you see how long it takes for the needle to drop. If it drops more than 1 psi per minute, then you have some form of coolant leak, either internal or external.
If you can't find any external leak, then you probably have either an intake manifold leak, or blown head gasket. A leaky intake manifold, however, will not cause the coolant to mix with the oil.
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Wednesday, September 26th, 2007 AT 1:05 PM