first thing I would do is .......
Take off breather , with the engine warmed up and idling put your hand on top of the carb blocking air to the carb .....
If the engine continues to run or speeds up you have a vacuum leak , BY SHUTTING OFF AIRFLOW THE ENGINE SHOULD DIE
check all vacuum hoses and connections , check the carb base gasket by spraying penetrating oil WD40 or something like that if a leak is present the engine will speed up.......
.... if you use starting fluid or carb cleaner you may just find a second reason for hesitation which is bad plug wires .... you'll know this when the carb cleaner explodes and you burn your car to the ground....NOT RECOMMENDED....
If you are certain there's no fuel problem then check ignition problems , the best telltale factor you have as to the performance of your engine is the spark plugs
engines need 3 things to run
proper air/fuel mix
spark/timing
compression
by looking at your plugs you can more or less determine how your engine is running
brownish looking plugs means everything is proper good running
black sooty plugs says you have a problem with
a/f mixture engine running rich.....clogged air filter...choke not opening properly etc......low compression
spark problems high resistance in secondary..... dist cap , rotor , wires , plugs
white powdery looking plugs.....vacuum leak....... clogged fuel filter(this would likely have more affect than tip in hesitation..ie poor performance at high rpm ..engine surge(also a vac leak problem)
if the plugs are all the same color then check for something that would affect everything , if the plugs are not consistent in color with each other look for something affecting the odd colored plug.
if you find a clean plug chances are it was steam cleaned ...guess where that came from
I hope this helps you out , it will at least give you an
Idea where to start .........
it doesn't matter how many computers are on a car .....an engine is an engine