Check engine light on

You have a problem with fuel, spark, or compression. Since the light is on, there will be at least one diagnostic fault code stored in the Engine Computer. Have that code read first. Many auto parts stores will do that for you for free. You will very likely have a code that specifies which cylinder is misfiring. A simple place to start is swapping two spark plugs to see if the misfire goes to a different cylinder. Of course you could just replace the plugs and wires. If you have the newer coil-on-plug setup instead of spark plug wires, try switching two coils to see if the problem goes to a different cylinder. You can do the same thing with injectors although that's a lot more involved, plus, Chrysler has extremely little trouble with their injectors. A compression test might show a mechanical problem relatively quickly. A better test is a cylinder leakage test. That takes a lot longer but will identify WHY the compression is low.