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Fire went out!
FWIW, I've had this happen twice - two different '87 5KTQs. The first one it
was the fuel pump relay, which you've already checked. The second one it was
the coil. I replaced it, but may not have needed to. I found a great deal of
oxidation on the terminals and connectors. (I've since decided to clean that
stuff about once a year on all four of our Audis.)
And, as Phil Payne pointed out, the engine ground can also be a problem. I've
not had one get so loose/corroded that it hindered starting. BUT I have
forgotten to attach them on occasion and had the fail-to-fire symptoms.