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Sounds like a problem I had and fixed. But before I cover that, let me raise another point.
My starting procedure, per the book, is different from yours. I don't know for Turbos or other years, but the procedure for my two 337s (a '69 and a '73) differs in two ways. First, I don't wait 7 seconds and instead I wait until it reaches max flow on the guage and then go 1 more second, but second and far more important is that I turn off the boost pump before engaging the starter. This second point goes along with one step you probably do but didn't mention, which is to bring the throttle down from full throttle to idle before engaging the starter (a step I do after turning off the boost pump).
Now to the problem. One day the rear engine started giving me trouble after it started, wanting to shut-off. Only by hitting the boost pump every few seconds, as the rpm were dropping on the way to shut-off, could I keep it running. After a few minutes (somewhere between 2 and 5) it would run OK without help from the boost pump. It turned out to be the fuel manifold/divider (P/N 631351..., often called the "spyder") which had a busted diaphragm and was leaking. As soon as we replaced that, the problem went away.
Ernie
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