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its a Nissan for starters but it could be the plug wires or the plugs or the distributor
"What causes cars to hesitate?
If they are vacuum operated then it could be the hubs.
A bad transmission gear can cause your 1999 Nissan frontier to shift hard. Low transmission fluid can also cause the transmission to shift hard.
The low pressure switch will do that when the system is low on freon.
Torque does.
On a 19 year old vehicle I would suspect you have a vacuum hose that is leaking. Replace all under hood vacuum hoses.
Front shocks. You may feel what I could describe as an "UP" bounce feel. If you replace the front shocks this will minimize that feel. However, the Frontier front suspension is quite "bouncy" good truck.
Some people hesitate because they want to pause and think things through, others are afraid or uncomfortable.
An accelerating force is the force which causes accelerated motion.
poor tune up.
Bad speed sensors can cause the car to hesitate when accelerating at speeds below 20 mph. The blockage of the air filters can also cause the car to hesitate when accelerating at speeds below 20 mph.