90 780 bertone - had several times over last few weeks when it would start fine but had little power to back out driveway - would die at end of driveway and not restart until later - sometimes a few hours and sometimes a few days. Then would start and run fine for several days.

Did the same thing a week ago but now will not restart at all. Has fuel (can hear fuel pumps running when key is turned to start, also disconnected fpr and found good fuel flow out of fuel rail when cranking, can smell gas at tailpipe when cranking). Also has spark (verified by timing light on #1 plug wire while cranking).

I have tried swapping the radio supp relay and the fuel relays even though the presence of fuel and spark would suggest they are ok.

Not sure what to check next - ideas appreciated!

Jim