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Guess I tested wrong; I did not hold the throttle open. I'vs never seen that mentioned. Makes sense: can't build pressure if the air can't get in. Seems obvious now.
I am learning stuff, anyway. Should I test with and without adding oil to the cylinders? One of my company's fleet maintenance people said so.
If it's the fuel system, which looks more and more probable, I guess it's worth hauling it off to the dealer to have them clean the fuel system when they do the 18K mile service. I don't think I could tackle it myself.
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