Only by the fact that you are changing the valve guides and seals at the same time.....but a new head is a very expensive way of changing them!
If you can't fix it with a hammer, you've got yourself an electrical problem!
before you add any additive you can do 2 different tests to see what it is. Do a compression test to try to locate what cylinder(s) are causing the issue. After that do a leak down test to verify what the problem is exactly. Very easy tests to do just time consuming do to the spark plugs.
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