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George,
Before you run compression & leakdown tests, best to try to free up what has become gummy while your car has been sitting in the garage.
Run 1/2 tank of gas with a bottle of Techron. Spririted driving, with lots of upper rev range work under load. Short stints [up to full op temps] are better than three hours on the freeway.
Gum and coke deposits are most likely in a stored engine, and they will give misleading results. Try to free things up with the Techron before testing. Will give you more accurate results.
BTW, while the manometer approach is scientifically correct, one critical aspect of a leakdown performed by a specialist 911 tech is the listening part - listening for where the leakage is passing. There is a surprising amount to be learned from gas noises in the intake and exhaust maniflolds while the test is in progress.
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