What I going on with my car?

My Buick will stall out on the freeway on the Main
Street and just setting I’ve changed the MAF MAP
Crankshaft O2 sensors fuel pump spark plugs and
wires ICM twice Coil Pack Ignition switch I had it at
the buick gmc place for 2 months they couldn’t find
the problem my fuel regulator works I’ve checked
my purge valve and continues to shut off. I’ve have
to let it sit somewhere overnight to get it to start for
and run for 30 mins I’ve put more into car in the last
2 years than I paid for the car it was working fine for
the first 2 years but these last 2 years I might drove
it for a month I don’t what’s wrong I desperately
need help it does have any codes it just stalls it
cranks but it doesn’t turn over I’m lost I know
Buick’s are good cars but the particular car doesn’t
work for me at all now I need help