Hmmm!

What resyncer did you buy? Are you certain it's for the motronic engine & not the gems?

Have you tested the fuel relay under the bonnet? You can swap them around, colour for colour.

I had the same problem on my 4.6. Was convinced it was the crank sensor; but as Rick says I swapped the relay and hey presto, its been ok since. Worth a try.
 

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