Nissan Altima: 94 Altima: While accelerating, the vehicle hesitates and even jerks

Could be your mass air flow sensor. That unit can often be cleaned with
carborator cleaner.

It could also be a vacuum leak. Carefully inspect all vacuum lines and
make sure they are not pinched, are properly hooked up properly and not
have leaks in them.

So would this problem only occur when the car is working at a higher temp
than normal? This started last summer no one could diagnose the issue,
everyone said it must be the transmission? Then of course the transmission
specialist could not reproduce the problem. When it cooled off for winter
outside the problem not one time occurred. We now are experiencing a heat
wave in the south and it is happening every time I use the car. It is so
embarrassing, there are usually people backed up behind me! I also bought
the fuel treatment that was STP combination treatment for the entire fuel
system including the corroborator. Whatcha think?

Kmorris wrote: 
temp 
issue, 
transmission 
winter 
heat 
so 
bought 
fuel 

We should first define what you mean by hesitation and I am assuming
your car is an Automatic:

When you press the gas pedal, does the engine rev up normally but the
car not move, then?
If so, does it then slowly start moving or all of the sudden slam into
gear and move?

If the engine revs ok but the car does not move, it could be your
transmission or fluid. Just making sure, but you have your transmission
fluid at the right level, right?
I've seen it where grit gets into the fluid and causes this sort of
behavior. You could get your transmission fluid changed, which is
inexpensive option to see if that fixes the issue.