1993 Buick Regal 3.1 Repair

I have a 1993 Buick Regal 3.1, when starting engine cold, it starts after about 6 trys, it kind of has a rough idle. When you start to drive it, it sputters and either dies out or has full power. Mechanics have checked it out at said that it wasn't the fuel pump, fuel injectors or spark plugs, but assuming that there's a vacuum leak or a bad sensor. Really need help on this, please respond ASAP.

Thanks,
Liz

Welcome to AF, many things cn cause this and require on site diagnosis, fuel pressure, clogged fuel filter, ign control module and so on, no quick answer here, sorry.