My 15 yr old '00 efi 5vze runs smooth.
and maintaining that is not a difficult thing.
Carburetor's on a 4X's are for crap.
In fact... purdy much any vehicle IMO.
Carburetor's lose engine power at higher elevations...
whereas fuel injection is more efficient and is less affected.
Even worse IMO...
A carburetor's float can run dry on a steep incline.
This could cause an engine stall... and could have a bad outcome.
If yer junk is running rough...
there is likely something wrong with it...
and you or others have missed that.
It's not the fault of it's engineering...
but more likely the lack of or inept maintenance.
Get used to efi... it's here to stay.
the other options would be a bus or taxi
Could be as simple as using the wrong spark plugs...
a dirty fuel filter... injector or even a faulty sensor.
Whom ever you pay to do your work
must not be very good at it.
pony up for a quality technician
whom has the right tools/equipment to diagnose the issue.
I'm 53... and grew up with old skool technology...
can't say I miss it at all.
Carburetors/distributors are more maintenance
then modern efi vehicles
no matter what old skool fantasy is stuck in yer head.
I had a carb'd '84 Toyota 4X
nearly killed me when it stalled once