[s-cars] No start problm - HELP!

[Tony Curran]

OK folks, get in car this am and turn her over. Engine catches then dies in
a couple of seconds. Try again same thing. On 5th or 6th attempt plus foot
on gas pedal, engine catches and runs tho as soon as I lift off gas, engine
dies. CEL stays lit!

Recently replaced Hall Sender, but don't think this is it as engine starts.
Reference sender?

Also, couple of times when I turn inginition, lights come up, no engine turn
over or start and there's a rattling or buzzing noise. Ignition switch (tho
current one is 8 mnths old)?

Thanks for help.

Tony
96 S6