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Could be many things. But spark and fuel most common. 1st, is car getting adequate fuel? Check fuel pump or fuel filter. Then spark. Use spark plug tester for spark. Then mechanic.
If the CHECK ENGINE light is on, you will need to readout stored codes and correct any conditions implied by the error codes.
Once you have done that, considering that the vehicle is now nearly 13 years old, change the fuel filter, then check pressure at the fuel rail. If pressure at the fuel rail is incorrect, replace the fuel pressure regulator and check function of the fuel pump. Also, check to be sure that the fuel pickup strainer in the tank isn't clogged with debris.
Additionally, many problems like the one you are describing are caused by fuel contamination, especially where ethanol blend fuels are used. Try replacing all fuel in the system, preferably with non-ethanol fuel.
Also, you're likely due for a major tune-up, including new plug wires and coil packs.
Check to see if you have a fuel pressure sensor in the fuel manifold . It is there to stop the pump working when the pressure in the manifold is held constant . IT sends to the ECM which in turn activates the pump relay and turns the pump on.
Have you changed your fuel filter lately? How about a tune up. Those are the things I would look at first and also check the fuel pressure with a fuel pressure gauge to make sure the fuel pump is not getting weak.
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