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.

1991
C1500
V8-5.7L
Chevrolet
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