Q: My truck bogs down when I accelerate going down the road

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It doesn't do this all the time but When I'm going down the road after about 30 minutes of driving my truck will sometimes bog down when I try to push on the gas pedal and it acts like it's going to cut off and the engine misfires.i can hear it. I have changed my fuel pump, fuel filter, plugs and wires, distributor cap, rotor button, air filter and the problem is still consistent. My fuel injectors are clean. I smell gas all the time too so I think I have a rich fuel mixture. It does this about every 2 to 3 days. I'm not sure what else it could be. Need help ASAP. Thank you.

My car has 178800 miles.
My car has an automatic transmission.

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