Not sure what the cause is, so I wasn't sure which forum to put this under. I have a 2012 FX4 5.0 that's a year old with 31k miles. I have an issue that's occurred since I've owned the truck. With my warranty nearing expiration, I might have it checked out.

Under low acceleration, or rolling at slow speed such as just pulling out, the truck starts to buck a little. Or you can almost feel it pulsing. It almost seems like a throttle positioning issue, or a computer programming glitch. My truck has the hill assist feature that prevents rolling backward on hill pull out. I think it might have something to do with that possibly too. I'm assuming that applies some amount of fuel to prevent from rolling backward, in which case under a non-accelerating, rolling condition it might be trying to prevent that condition.

Anyone have any experience with this or have a similar condition?

 

My truck would bang into second gear if I just got rolling and let off. Like in a parking lot or at a red light. Not sure it is the same as yours but there is a TSB for a computer reflash to fix it.

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