Tough one to call without getting your hands dirty on the car...
Could be a weak battery or the grounds getting a bit weak. Try cleaning off the battery terminals & the connectors. Check that braided line connecting one corner of the coil pack - Just loosen the bolt a bit then tighten it down again. It is rare they need attention, but you never know.
Perhaps the fuel pump or fuel pump relay are starting to fail. The relay is a cheap fix, you could even just swap it for the horn relay & see if that helps.
Double check the fuel cut-off to make sure it is properly reset. I've heard of a good bump or RR tracks tripping them. Not usually on the Contiques, but it does happen & costs nothing to check. Even happened on my Merc once. I have no idea what tripped it 'cause it was sitting in my car port over night & it ran fine when I parked it.
Other than those simple things, I really don't know what to suggest.
