Time for a compression check.
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Yupp just bought a tester last night. You figure the PCV system looks ok? Without knowing the condition of the valve of course.Time for a compression check.
Hope this sorts out without any real major engine work. In the process of putting a 2F into my fj40 - pulled out a v8 and went back to a more original configuration. Got a good deal on a low milage engine. You might consider an engine swap if you find "big" issues with yours.