Q: Running bad.

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My truck spits and sputters going down the highway. It also dies at stop lights and when I put it in reverse but it starts right up. I have changed my PCV valve EGR valve throttle positioning sensor I'm just out of ideas. Any ideas would be appreciated. I have also changed out my cap and plugs and wires when they all this started. Thank you

My car has 400000 miles.
My car has an automatic transmission.

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