Well if you're convinced its feul starvation its either something tripping ECU
or something mechanically wrong.
Have you tried all the generic fixes to do with bad starts? Clean EGR
, change TDC
sensor. Etc etc?
Leaking feul - if large amount wouldn't let car start and car would cut out. Small amount would cause hesitation especially pulling away, perhaps cut out. All these syptoms would be 'spluttery' rather than 'crisp' problems. So if they are as they sound - clear/crisp cut offs it points to ECU
Perhaps as its such a strange problem its worth having a proper diagnostic ran on it? - could spend a lot of time and cash trying to fix something that could have been trivial.. personal opinion