One problem can lead to another. I know the feeling. Easiest place to start is a HUGE tune up. Oil and gas change, spark plugs and wires, oil/gas filter change, cap/rotor, fuel pump, engine/radiator flush and pretty much anything else you can think of. Those items listed above might not be the problem but they will need to be changed in the future and hey all those things would be out of the way and it will make it easier to find the real problem.
You might be fine to who knows until you get your hands dirty. Always remember, ask questions, take pictures and Jeep on!