What does it mean when your car hesitates when you give it gas?
An engine that hesitates when accelerating is either sucking too much air, not getting enough fuel, or misfiring. Here's what you might discover—and what you can do to fix the problem: Dirty air filter. The Fix: Replace the air filter. via
Why is my Jeep sluggish when I accelerate?
Defective Fuel Pump: The fuel pump pulls the fuel from the gas tank to the engine via the fuel lines. If the pump stops working, malfunctions, or becomes clogged, it will not supply enough fuel to the injectors. This can cause the vehicle to accelerate slowly, or even sputter and stall, especially at high speeds. via
Why does my Jeep struggle going uphill?
You could also have a fuel system issue, causing the vehicle to run very lean (low on fuel) especially when uphill. To put it in perspective, when you go uphill, the fuel system has to pump fuel from the back to the front, and with the front higher, the fuel system is now working against engine demand and gravity. via